Starts the bit cleanly on uneven surfaces and bores smooth, flat bottomed holes. Fits 3/8 in and larger drills and drill presses.IRWIN Marples forstner bits drill clean and precise flat-bottomed holes and pocket holes quickly and easilyTeeth designed for clean holesCutting angles maximize speed of cutReduced shank fits 3/8 in and larger drills and drill pressesBrad point tip starts cleanly on uneven surfaces