Description:

Made for drilling pilot holes for screw sizes 5mm, 6mm,7mm,8mm,10mm.11mm.12mm. FLEXIBILITY, REMOVABLE and ADJUSTABLE: Its convenient to use the combination of Hex Key to adjust or disassemble the countersink drill bit and the five-flutes chamfering.. High speed heat treated steel:countersink drill bits are made of high speed steel, QUENCHING treatment, so they are HIGH HARDNESS, WEAR-RESISTING and DURABLE.. Applies to:drilling machinery with chuck or joints. Seven Stop Collars, Bit sizes: 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32".