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Four piece set includes bits for drilling location holes for screw sizes 3mm, 4mm, 5mm, 6mmSpecial designed steel counter sleeve countersinks or counter bores location holeDrill and countersink for wood screws without changing bitsAdjustable counter sleeve depth with wrenchTRI-POINTED DESIGN: The tri-cuspid countersink make sure drills will not produce offset, not easy to slip, good for accurate and fast drilling. The five-edged chamfer design of the countersink drill helps to remove chips from the holes on both sides automatically and quicklyHIGH CARBON STEEL : This Countersink drill set is made of high and carbon steel which offers solid countersink, sharp drill bits with high hardness and good abrasion resistanceREMOVEABLE& ADJUSTABLE: The countersink bits are easily adjustable with the included hex key wrench which makes it convenient to adjust the depth of the bit before the countersink hits the materialPACKAGE CONTENTS: One set of countersink drill bits comes with 4 pieces of countersink drill bits in 4 size, #3 #4 #5 #6mm, and 1 piece of L-shape hex wrench includedMULTIPLE USES: This countersink drill bits set is widely used in woodworking projects, softwood & hardwood, fiberboard, particle board, plywood, plastic, PVC and soft metals