Product Description: Material: High Speed Steels Shape: 5 blade Edge: 90 degrees Size: 6mm, 8mm, 9mm, 12mm, 16mm, 19mm Length of milled bits: 48mm / 1.88 Package includes: 1 x 6mm (1/4'') Drill Bit 1 x 8mm ( 5/16'') Countersink Drill 1 x 9mm (3/8'') Countersink Drill 1 x 12mm (1/2") Countersink Drill p> 1x 16mm (5/8'') Countersink Drill Bit 1 x 19mm (3/4'') Countersink Drill High Quality and Efficiency: With high frequency quenching for heat treatment, HSS milling chisels have a high level of hardness and toughness. The drill is suitable for most power tools. With 90 degree angle and precise countersunk holes, it is helpful for titanium coated precise drilling. The bevel cutter kit is rust-free and has a long life. Eliminates vibration and noise: bits are hardened and polished to improve clarity. With a rattling design and offset incisors, a fast rattling cut can be achieved. The drill bits have a 90 degree angle on the tip for clean and precise countersinking. The five-groove design provides small chip loads and faster removal. It can drain sawdust faster and easier during use. Excellent Design: Standard 1/4" hex bits help you drill quickly and prevent chucks from slipping. There are numbers on the appropriate countersink bits so you can easily select the one you need, 1/4" quick change hex shank, 5 -Bevel blade with groove, 90 angle at the tip for a clean and precise milling. There are numbers on the corresponding countersunk cutters. Widely Used: Countersink drill bit set is ideal for chamfering, deburring and countersinking. Suitable for beveling low hardness materials such as wood, plywood, aluminum board, fiberboard, particleboard, plastic, PVC board and other soft materials, but do not not suitable for metal. Package contains: 6 countersunk bits, size: 6mm (1/4''), 8mm (5/16''), 9mm (3/8''), 12mm (1/2''), 16mm (5/8''), 19 mm (3/4 inch). Can meet your different needs in different situations.