【Ideal Combo Set】This drill and countersink set includes i) 7 countersink drill bits, sized for #3, #4, #5, #6, #7, #8 and #10mm screws; ii) 3 countersink bits with most commonly-used sizes: 12mm(1/2"), 16mm(5/8"), 19mm(3/4"); iii) 1 free hex key wrench. One-stop Combination Package for drilling, countersinking and counter-boring hole!

【PREMIUM QUALITY】These countersink drill bits are made of industrial grade high-carbon steel, which provides hardness, superior cutting power and durability. Ideal for household and DIY Projects.

【EFFICIENT DESIGN】#3mm-#10mm drill bits have tricuspid point + round shank while #12mm-#19mm countersinking bits have 90°on the point + 1/4" hex shank for quick change, tight clamping and precise countersinking; Both have chatter-free,5-edged chamfer cutter for easy chip removing with cutting edges hardened and honed for sharpness.

【REMOVABLE& ADJUSTABLE】The drilling depth of #3-#10 drill bits are adjustable for screws of various lengths; Meanwhile, their bits are removable for easy cleaning, sharpening,and replacement.

【MULTIPLE APPLICATION】 Perfect for Wooden planks, Fiberboard, Particle board, Plywood, Plastic, PVC and soft metals; Suitable for hand drill, bench drill and electric drill; #12,#16, #19 Countersink Bits are especially fine for quick drill. × NOT for hard metals or steel board.