Product Description Description: 100% brand new and high quality. Special Reminding: 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''). Eliminates Chatter & Vibration: All have a 82°/90° angle (option) 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 arranged to insure free chip flow and rapid chatter free cutting. Widely Application: Ideal for wooden planks, fiberboard, particle board, plywood, plastic, aluminum board, PCB board and more. Premium Design: Great for Sinking Holes into Wood and Soft Metals Countersunk Screws and Fixings. Suitable for DIY, Home and General Building/Engineering Using. Sweet Tips: 1/4″ 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 work surface. Be sure to measure the size of your plug to be sure your countersink’s body will make the right-size hole. Notice: There will be a slight color difference between the picture and the actual product. Specification: Material: High Speed Steels Finish: Titanium Coated Number of Flute: 5-Flute Size: 6mm(1/4''), 8mm(5/16''), 9mm(3/8''), 12mm(1/2''), 16mm(5/8''), 19mm(3/4'') Quantity: 1 Set (6 Drills) Length: 48mm / 1.88'' Shank Type: Hex Split Point Angle: 82° / 90° Package Included: 1PCS X 6mm Countersink Bit 1PCS X 8mm Countersink Bit 1PCS X 9mm Countersink Bit 1PCS X 12mm Countersink Bit 1PCS X 16mm Countersink Bit 1PCS X 19mm Countersink Bit