The fret saw or coping saw is suitable for processing wood, metal, and stone. Sold with extra blades.
Knew Concepts 5 Woodworker Fret Saw with Lever Tension
Fret Saw with Lever Tension – FindBuyTool
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Tech Review: Knew Concepts MK4 Saw Frame
Made from 1/8-inch-thick milled aluminum with a red anodized finish. The ultra-lightweight truss-style frame weighing just 5.1 ounces is quite rigid allowing the blade to be tensioned to a full 40 pounds minimizing blade breakage and defection and improving overall cutting accuracy. The set of knurled blade clamps knobs securely grip the blade and prevent slippage.
Knew Concepts 125.005C MK III 5 Cam Lever Fret Jewelers Saw with 12 Each #7 15 TPI Pegas Fret Saw Blades
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How to tighten your saw blade on a Knew Concepts saw with lever tension.