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 95 Cast Iron 65 Tool Steel Stainless 45 Brass 130 Aluminium 145 Wood 1200 Recommended for use with large arbor or large quick release arbor.