General description 26 Pieces Countersink Drill Bit Set includes a variety of drill bits designed for wood and metal applications. This comprehensive set features 8 Wood Plug Cutter Drill Bits, 7 Tri-Point Drill Bits, 6 Countersink Drill Bits, and 3 Step Cone Drill Bits, making it suitable for various drilling tasks. Technical specifications Material: High-quality carbon steel with titanium coating Countersink drill bit length: 48mm Dimensions of drill bits: 3mm diameter x 60mm length, 4mm diameter x 75mm length, 5mm diameter x 85mm length, 6mm diameter x 93mm length, 7mm diameter x 10mm length, 8mm diameter x 11mm length, 10mm diameter x 12mm length Step drill bit sizes: 4-32mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm) Shank diameter: 9.3mm Shape: 5 flutes Edge: 90 degrees Compatibility and accessories Compatible with bench drills, hand drills, and other professional drilling machines Includes 1 x Automatic Center Punch for marking