Hex & round both shank flat drill bits set for spade boring in wood, Plastic, Pvc, Etc. 18 mm, 20 mm, 16 mm, 10 mm, 12 mm & 25 mm, Made of heat treated high, Carbon steel. Flat wood drill bit used for accurate wood drilling. A very high standard of flat bit set in a blister packaging. This flat drill bits can be use in various materials like hard & soft wood, Plastic, Pvc and other soft materials. Grooved head for excellent centering. Easy to start bit drilling on center. Hexagon shank for secure chuck fitting and prevents slippage. Heat high hardness, Treated high, Carbon steel. Is suitable designed to pair with most power drills. Specifications material flat drill, Tempered steel bits size 18 mm, 20 mm, 16 mm, 10 mm, 12 mm & 25 mm, Length of drill bit 150 mm, Diameter of hex shank 6. 35 mm 1/4