Pilot Drill Bits,For Concrete,4 1/2 L
.- Imperial 1/4 in Pilot Drill Bits, Pilot Bit Size 4 1/4 in, Pilot Bit Shank Style Hex, Pilot Bit Shank Size 1/4 in, Pilot Bit Overall Length 4 1/2 in, Pilot Bit Material Carbide, For Use On Concrete, Nail-Embedded Wood, Fits Hole Saw Dia.