Variable tooth unique variable tooth geometry for consistent cutting ability in a wide range of materials Manufactured to strict Alpha specifications to suit demainding Australian conditions 8% cobalt Bi-metal gives ultimate performance and superior welding technology prevents tooth strippage 38mm cutting depth Recommended Speeds Mild Steel 80 Cast Iron 40 Tool Steel Stainless 50 Brass 100 Aluminium 120 Wood 1000 Recommended for use with large arbor or large quick release arbor.