Pilot Drill Bit, Pilot Bit Size 1/4 in, Pilot Bit Shank Style 3-Flat, Pilot Bit Shank Size 1/4 in, Pilot Bit Overall Length 1 7/8 in, Pilot Bit Material Carbide, For Use On Aluminum, Copper, Metal, Mild Steel, Stainless Steel, Fits Hole Saw Dia. - Imperial 3/4 in to 4 1/2 in