Knew Concepts 3" Mk.III Fret Saw – Lever Tension

Designed for fast, repetitive blade changes, the Knew Concepts 3" Mk.III Fret Saw with Lever Tension is especially convenient for piercing and other work that requires frequent blade removal and reinstallation.

The lever system allows blade tension to be released without changing the established tension setting. Simply flip the lever forward to release the tension, reposition and secure the blade, then return the lever to the rear to resume sawing.

The compact 3" frame provides excellent maneuverability for jewelry making, metalsmithing, model making, and other detailed precision work.

Features & Benefits

• 3" throat depth for jewelry and small precision work
• Cam-lever blade tensioning for fast, repetitive blade changes
• Excellent for piercing and interior cuts
• Blade tension can be restored quickly after releasing and resetting the blade
• Fine tension adjustment remains available through the tension knob
• Extremely lightweight at just 117.6 g with blade
• Compact frame is easy to maneuver around small workpieces
• Ideal for jewelry fabrication, metalsmithing, model making, and precision craft work
• Lighter alternative to the heavy-duty Mk.IV series
• Made in the USA

Specifications

The live Micro-Tools listing confirms the SKU, MPN, UPC, brand, lever-tension operation, and country of manufacture; Knew Concepts confirms the model weight.

Fast Lever Tension for Piercing

The biggest reason to choose 125.003C over 125.003 is the lever-tension system.

Piercing work often requires you to release the saw blade, thread it through a drilled opening, clamp it again, make the interior cut, and then repeat the process for the next opening.

With the Mk.III lever system, tension can be released with a quick movement of the lever rather than manually backing off the screw tension each time. Once the blade is reinstalled, returning the lever to its cutting position restores the established setting when the same blade size is used correctly.

That makes this model particularly useful for:

• Pierced pendants
• Earrings
• Decorative sheet-metal patterns
• Interior cutouts
• Small filigree-style designs
• Nameplates
• Fine jewelry components
• Model-making projects

Exceptionally Lightweight

Knew Concepts lists the 125.003C at only 117.6 grams with blade.

That very low weight is one of the Mk.III line’s biggest strengths.

A lightweight saw is easy to maneuver around small workpieces and can feel noticeably different during long bench sessions, especially for detailed jewelry fabrication where the saw remains in your hand for extended periods.

For comparison:

Knew Concepts confirms all four weights.

The lever mechanism adds only 2.6 grams compared with the screw-tension 125.003.

Compact 3" Throat

The 3-inch throat keeps the frame compact and maneuverable, making this model especially well suited to smaller workpieces and jewelry-scale fabrication.

It is a practical size for:

• Earrings
• Pendants
• Rings
• Small bracelets and components
• Pierced sheet metal
• Decorative findings
• Model parts
• Fine craft projects

For work that rarely requires a deeper frame, the 3" size keeps the saw light and easy to handle.

Precise Tension Adjustment

The lever handles the repetitive release-and-reset operation, but the Mk.III still gives you manual control over fine blade tension.

Knew Concepts’ instructions note that the tension knob can be adjusted when needed, particularly when changing blade size. Once the desired tension is established, the lever makes it easy to return to that setting during subsequent blade changes.

This provides a useful combination of manual adjustment and rapid repeatability.

Ideal for Jewelry Piercing

The 125.003C is particularly attractive for jewelers who do frequent piercing but do not need the heavier frame of the Mk.IV.

The workflow is simple: release the lever, thread the blade through the starter hole, clamp it, return the lever to the cutting position, and continue sawing.

That can save time on designs containing multiple interior openings while keeping the frame exceptionally light.

Mk.III vs. Mk.IV

The Mk.III and Mk.IV are best viewed as different approaches rather than simply one being “better.”

The Mk.III prioritizes:

• Very low weight
• Light, maneuverable handling
• Lever convenience
• Jewelry-scale precision work

The Mk.IV prioritizes:

• A heavier-duty frame
• Greater rigidity
• Higher blade tension
• Reduced vibration

For a customer who values minimum tool weight, the 125.003C is particularly attractive. For someone who prioritizes the stiffer, higher-tension feel of the heavy-duty frame, the 124.003C Mk.IV is the better fit.

125.003 vs. 125.003C

These two models share the same 3" Mk.III format but use different tension systems.

125.003 – Screw Tension
Blade tension is manually adjusted using the tension knob. It is the simplest and lightest model.

125.003C – Lever Tension
Adds the cam lever for quick release and restoration of blade tension, making repetitive blade changes more convenient.

The weight difference is tiny—115 g versus 117.6 g—so the purchasing decision is really about how often you expect to release and reinstall the blade.

125.003C vs. 125.003CS

The next step up in the Mk.III 3" family is 125.003CS.

Both use lever tension, but the CS model adds swivel blade clamps and weighs 130 g.

Choose the 125.003C if you want:

• Lever tension
• Fixed blade orientation
• Minimal weight
• A simple precision setup

Choose the 125.003CS if you also want to rotate the blade independently of the frame.

Ideal For

The Knew Concepts 3" Mk.III Lever Tension Fret Saw is an excellent choice for:

• Jewelry making
• Jewelry fabrication
• Piercing
• Metalsmithing
• Silversmithing
• Goldsmithing
• Small sheet-metal work
• Model making
• Precision craft work
• Jewelry schools
• Professional studios
• Serious hobbyists

Frequently Asked Questions

What is the Knew Concepts 125.003C?
It is the 3" Mk.III Fret Saw with Lever Tension.

What does the lever tension system do?
It allows blade tension to be released and restored quickly, making repetitive blade changes more convenient.

Is it useful for piercing?
Yes. Micro-Tools specifically identifies rapid repetitive blade changes, such as those used during piercing, as a key advantage of this design.

Does the blade tension need to be reset every time?
When reinstalling the same blade size correctly, the established setting can generally be restored simply by returning the lever to the tensioned position.

How much does the saw weigh?
Knew Concepts lists the 125.003C at 117.6 grams with blade.

Does this model have swivel blade clamps?
No. The 125.003C has fixed clamps. The corresponding swivel-clamp model is 125.003CS.

What is the difference between 125.003 and 125.003C?
125.003 uses screw tension, while 125.003C adds lever tension for faster blade release and resetting.

Is this lighter than the Mk.IV 3" saw?
Yes. The 125.003C weighs 117.6 g, while the 124.003C Mk.IV weighs 179.1 g.

Where is the saw made?
Micro-Tools lists the 125.003C as made in the United States.

Micro-Tools makes every attempt to provide accurate information for each item. Actual packaging and/or specifications may be slightly different from the information and picture provided.