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 120 Cast Iron 75 Tool Steel Stainless 60 Brass 160 Aluminium 180 Wood 1800 Recommended for use with large arbor or large quick release arbor.