High Speed Steel Single-End Countersink Metal Deburring Drill Bit Set Scientific Design: Spiral flute cutters help to evacuate chips upwards, reducing clogging. Main functions: Countersunk head deburring drills can be used for deburring cross holes, deep holes, straight edges and curved edges. Suitable for MDF, plywood, acrylic, PVC board, plastic and soft metal. Countersunk Head Deburring Set: High Speed Steel Titanium Coated Countersunk Head Deburring Set, including 4 popular sizes: 2-5mm, 5-10mm, 10-15mm, 15-20mm head diameter. Drill Bit Set: Four sizes of drill bits to meet daily industrial tool replacement needs. Rugged and Durable: Rust-resistant, durable bits cut smoothly without chattering and fluted edges. Color: Multicolor Size: 2-5 (holes in the range of 2MM--5MM inverted, shank 6MM, head diameter 9.7MM), 5-10 (holes in the range of inverted 5--10MM, shank 8MM, head diameter 14MM), 10-15 (inverted 10MM--15MM range of holes, shank 10MM, head diameter 21MM), 15-20 (reverse 15MM--20MM range of holes, shank 12MM, head diameter 28MM) Quantity: 4pcs 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding. 3. Only the above package contents, excluding other products.