Ideal for: Steel, stainless steel, cast iron, non-ferrous metal, wood and plastic Heavy Duty - stays sharper longer Multiple ejection slots for rapid removal of thick and thin plugs (HSV40 and over) 4/6 variable tooth configuration reduces vibration for a smooth, accurate cut Unique multiple grinding technology for faster cutting and longer life Bi-Metal construction with 8% cobalt welded teeth for extended life in industrial applications International standard thread pattern accepts all common arbors Holesaw sizes up to 38mm dia: 38mm cutting depth Holesaw sizes 40mm dia and up: 48mm cutting depth Alpha CDT cutting fluid (code: ATL005) is recommended for increased life when drilling steel Recommended Speeds Mild Steel 580 Cast Iron 400 Tool Steel Stainless 300 Brass 790 Aluminium 900 Wood 3000 Recommended for use with a small arbor .