Description:Product name: Hexagonal shank five-edged chamferMaterial: High-carbon steelSize: 6mm (1/4''), 8mm (5/16''), 9mm (3/8''), 12mm (1/2''), 16mm (5/8''), 19mm (3/4'')Length: 48mm (1.88'')Quantity: 1 Set (6 High carbon steel drill bit)Features:1. Ideal for wooden planks,fiberboard,particle board,plywood,plastic,alumiumn board, pcb board, DIY, Home and Building/Engineering Using and more.2. These flute counter sink drill bit set are machined from high speed steels and are available in 6 different diameter sizes.3. Great for Sinking 90 Degree Holes into Wood and Soft Metals Countersunk Screws and Fixings, for sharp and precise countersinking, the cutting edge is hardened and honed for sharpness.4. 1/4 hex shank countersinks are fine for a quick drill, they don't slip in drill chucks.5. A Chatter-Free,five-flute designed with staggered cutting teeth aranged to insure free chip flow and rapid chatter free cutting.6. You can make deep countersinks easily by setting the countersink's depth stop to allow the countersink to drill more deeply into the worksurface.