These fluted countersunk drill sets are machined from high speed steel and are available in 6 different diameter sizes. Sizes: 6mm (1/4''), 8mm (5/16''), 9mm (3/8''), 12mm (1/2''), 16mm (5/8''), 19mm (3/4'') Eliminates noise and vibration - all of these are angled at 90 at the point for accurate and precise countersunk holes. Cutting edges are hardened and sharpened to maintain sharpness Chatter-free five-edge design with staggered cutting teeth to ensure free chip flow and fast, chatter-free cutting. Versatile applications - suitable for wood, fibreboard, chipboard, plywood, plastics, aluminium, PCBs, etc. Advanced design - ideal for drilling 90 degree holes in wood and soft metal countersunk head screws and fasteners. Suitable for DIY, home and general construction/engineering use. Note: There will be a slight colour difference between the picture and the actual product. You can view photos of other customer comments. We promise our products are 100% brand new. A gentle reminder: 1/4" hex shank countersunk holes are perfect for fast drilling. They do not slide in the collet. You can easily make deep countersunk holes by setting the countersunk hole depth limiter to allow the countersunk hole to be drilled deeper into the drill face. Work. Be sure to measure your collet size to ensure that your countersunk hole body will make the correct size hole. If you have any questions about the item, please contact us first so we can help you . Professional countersink bit set for your needs Specification Material: HSS Size: 6mm, 8mm, 12mm, 16mm, 19mm Quantity: 1 set (6 holes) Length: 48mm/1.88'' Features Durable and practical. Coloe:Gold Suitable for wood, fibreboard, chipboard, plywood, plastic, aluminium etc. Suitable for DIY, home and general construction/projects. Set includes. 1 x 6mm drill bit 1 x 8mm drill bit 1 x 9mm drill bit 1 x 12mm drill bit 1 x 16mm drill bit 1 x 19mm drill 1 x Gold Punch