Usage Tips:Titanium-Coated Countersink.Durable & Long service life. All drill bits have a 90° angle on the point for sharp and precise countersinking. The cutting edge is hardened and honed for sharpness. . Five-flute Design. A Chatter-Free,five-flute designed with staggered cutting teeth aranged to insure free chip flow and rapid chatter free cutting. 1/4 inch hex shank, fits most power tools. Multiple Application. Great for wood openings, reaming, chamfering, screw head and so on. Suitable for wooden planks, plywood, aluminum board, fiberboard, particle board, plastic, PVC board and other various soft material chamfer. Shank Type:Hex 1) Professional countersink bits for sinking 90 degree holes into wood and plastic countersunk screws and fixings 2) The self-starting point and five-fluted design eliminates chatter and vibration for smooth operation to make clean, accurate and burr-free cuts 3) Constructed with high-speed steel and coated with super-hard titanium, this bit has the durability to withstand high-heat conditions for lasting use 4) 6 pieces bits with popular size: 6mm(1/4inch), 8mm(5/16inch), 9mm(3/8inch), 12mm(1/2inch), 16mm(5/8inch), 19mm(3/4inch) 5) 1/4inch quick change Hex shank fits all handheld and stationary drills as well as the power drivers, Countersink perfect for Wooden planks,Fiberboard,Particle board,Plywood,Plastic,Aluminum Board ,Pcb Board etc Material:metal colour:Gold Package Contents: 6 x 1/4inch Hex Shank Countersink Drill Bits Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.