This Chip Breaker for 1-3/4" Planes from Hock Tools deflects shavings up and away from the cutting edge allowing the blade to shear the wood fibers before they lever up and tear out of the wood surface. This deflection also bends and breaks the shaving fibers so they can’t lift and tear out ahead of the blade. The action of the chip breaker pressing against the blade at the thin cutting edge also strengthens the edge, reducing flex and chatter. Hock Chip Breakers are .118" (3mm) thick for added mass, rigidity and support for the cutting edge. Fits 1-3/4" Parallel Cut Plane Iron.