Replacement inserts for all Cutech benchtop woodworking machines with Spiral Cutterheads. A tight tolerance is important for a fine finish without lines. Cutech's inserts are made in-house to a tolerance within 0.02mm. The tungsten carbide material lasts 50% longer than high speed steel inserts. Two-sided inserts sit in perfect alignment to the spiral cutterhead. Non-cutting edge designed to prevent insert from skewing while planing. The precision is superior to 4-sided inserts.