IRWIN TOOLS Marples Wood Drilling Forstner bits are constructed of tough carbon steel to stay sharp and produce precise pocket holes and flat-bottomed (blind) holes. The ultra-sharp cutting edges feature optimized angles to cut more quickly and accurately through hard and soft woods than traditional forstner bits. With a reduced shank, these bits fit 3/8" and larger drills and drill presses, these wood drill bits are ideal for fine woodworking, cabinet-making and more. Set includes 1/4" (6.3mm), 1/4" (6.3mm), 3/8" (9.5mm), 1/2" (12.7mm), 5/8" (15.8mm), 3/4" (19.0mm), 7/8" (22.2mm), 1" (25.4mm), 1-1/8" (28.5mm), 1-1/4" (31.7mm), 1-3/8" (34.9mm), 1-1/2" (38.1mm), 1-5/8" (41.2mm), 2" (50.8mm) forstner bits.