General description Neilsen 8pc HSS Drill Metal Bits Set includes a variety of reduced shank twist drill bits suitable for drilling in wood, metal, and plastic. Technical specifications Sizes: 13mm, 14mm, 15mm, 16mm, 18mm, 20mm, 22mm, 25mm Shank Diameter: 1/2" (approximately 12.7mm) Material: HSS (High-Speed Steel) Point Angle: Standard 118 degrees