Vermont American 16515 no.6 to no.10 Hex Shank Predrill and Countersink Assortment, 4-Piece
Use screw pilots for drilling clean pilot holes in wood, plastic and composite materials. Screw pilots provide fast countersinking and counter boring in one operation. Drill bit is replaceable. Hex shank countersinks fit all corded and cordless screwdrivers, drills and screw guns.