Excellent Performance: Countersink drill bit set for wood with tapered drill bit M2 HSS, 4 Flute countersink cutter for superior cutting power & durableProduct Feature: Standard 1/4 inch hex shank is quick change compatible and has an adjustable counter sleeve depth with Allen wrench, for flush screw heads or deeper to cover with matching plugsMeet Your Demands: #4(7/64), #6(9/64"), #8(11/64"), #10(3/16"), #12(7/32"), 5 pieces different sizes of countersink drill bits, satisfy you all demand. The most often used sizes for cabinet, furniture makers and other wood workingMultipurpose: The bits erfect for wooden planks, plastic, soft metals, fiber board, particle board, plywood, alumiumn boardStorage Case Included: Keeps your countersink bits organized and safe in a hard shell plastic caseExcellent Performance5Pcs 4-12# Carpentry Countersink Drill Bit Set 1/4" Hex Shank HSS Woodworking Pilot Screw HolesSpecial designed steel counter sleeve countersinks or counterbores pilot holeTitanum Coated HHSCountersink drill bit is made by heat treated and tempered titanum coated high speed steel for superior cutting power & durable.Meanwhile compared with ordinary the drill accuracy more highThe countersink drill bit have self-starting point and four-fluted design eliminates chatter and vibration for smooth operation to make clean, accurate and burr-free cuts.Standard 1/4 inch hex shank is quick change compatible and has an adjustable counter sleeve depth with Allen wrench, for flush screw heads or deeper to cover with matching plugsFast Chip RemovalFaster discharge of sawdust, you will get a nice smooth surface on any type of hard, soft wood or aluminumMultipurposeCountersink drill bit erfect for wooden planks, plastic, soft metals, fiber board, particle board, plywood, alumiumn board etc.