Irwin Marples Wood Drilling Forstner bits are constructed of tough carbon steel to stay sharp and produce precise pocket holes and flat-bottomed (blind) holes. Reduced shank fits 3/8-in and larger drills and drill presses, 1-1/2-in (38.1mm), 1-5/8-in (41.2mm), 2-in (5.8mm) forstner bits. Set includes 1/4-in, 1/4-in, 3/8-in, 1/2-in, 5/8-in, 3/4-in, 7/8-in, 1-in, 1-1/8-in, 1-1/4-in, 1-3/8-in forstner bits

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