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 100 Cast Iron 65 Tool Steel Stainless 50 Brass 130 Aluminium 150 Wood 1500 Recommended for use with large arbor or large quick release arbor.