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Four piece set includes bits for drilling location holes for screw sizes 3mm, 4mm, 5mm, 6mm Special designed steel counter sleeve countersinks or counter bores location hole Drill and countersink for wood screws without changing bits Adjustable counter sleeve depth with wrench TRI-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 quickly HIGH 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 resistance REMOVEABLE& 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 material PACKAGE 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 included MULTIPLE USES: This countersink drill bits set is widely used in woodworking projects, softwood & hardwood, fiberboard, particle board, plywood, plastic, PVC and soft metals