Variable tooth unique variable tooth geometry for consistent cutting ability in a wide range of materials Manufactured to strict Alpha specifications to suit demanding Australian conditions 8% cobalt Bi-metal gives ultimate performance and superior welding technology prevents tooth strippage 38mm cutting depth Recommended Speeds Mild Steel 130 Cast Iron 85 Tool Steel Stainless 65 Brass 170 Aluminium 195 Wood 1800 Recommended for use with large arbor or large quick release arbor.