Amana Tool - 46415 Solid Carbide Spiral Plunge 1/4 Dia x 1" 4 Shank Down-Cut auspowers_batchfour This gives it form so

This gives it form so it doesn't get twisted or bunch up which may cause a pinch flat

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Amana Tool - 46415 Solid Carbide Spiral Plunge 1/4 Dia x 1" 4 Shank Down-Cut auspowers_batchfour This gives it form soAmana Tool 46415 Solid Carbide Spiral Plunge 1 4 Dia x 1" 4 Shank Down Cut Spiral flute bits combine a shearing action in cutting with an auguring action in chip clearance. The shearing action yields an especially clean accurate cut while the auguring action clears chips from the cut. The down cut cuts from the surface down leaving a smooth edge at the surface. Special unique carbide grade increased clearance geometry and razor sharp cutting edges