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Features:These flute countersink drill bit set are machined from high speed steels and are available in 6 different diameter sizes.Size - 6mm(1/4''), 8mm(5/16''), 9mm(3/8''), 12mm(1/2''), 16mm(5/8''), 19mm(3/4'')90° angle on the point for sharp and precise countersinking. The cutting edge is hardened and honed for sharpness.A Chatter-Free,five-flute designed with staggered cutting teeth aranged to insure free chip flow and rapid chatter free cuttingIdeal for wooden planks,fiberboard,particle board,plywood,plastic,alumiumn board ,pcb board and moreGreat for Sinking 90 Degree Holes into Wood and Soft Metals Countersunk Screws and Fixings.Suitable for Home and General Building/Engineering Using1/4″ hex shank countersinks are fine for a quick drill. They don't slip in drill chucks.You can make deep countersinks easily by setting the countersink's depth stop to allow the countersink to drill more deeply into the worksurfaceSpecifications:Material: High Speed SteelsSuitable for: Soft metal, insulation board, wooden planks, plastic, soft metals, fiber board, particle board, plywood, alumiumn board etc.Size: 6mm,8mm,12mm,16mm,19mmQuantity: 1Set(6 Drills)Length: 48mm/1.88''Hex handle diameter: 6.35mmPackage includes:1 x 6mm Drill1 x 8mm Drill1 x 9mm Drill1 x 12mm Drill1 x 16mm Drill1 x 19mm Drill