Professional countersink bits for commercial or occasional use. This set includes 3pc tapered countersink drill bits with a 5 flute design and a 90-degree chamfer, suitable for a width range of 12mm to 19mm. The bits feature a 1/4" hex shank compatible with all types of drills, including electric, battery-powered, and air drills, as well as quick-release chucks for convenience. Constructed from hardened and tempered steel, they are suitable for use with both hand and power drills. These bits are ideal for countersinking soft metals and wood, perfect for creating 90-degree chamfer holes for countersunk screws and fixings. Specifications: Sizes: 12mm, 16mm, and 19mm; 3pc countersink bits; 5 flute; 90-degree chamfer; 1/4" hex shank; 22mm shank length; HRC 40-42; suitable for soft metals and wood; hardened bits.