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 230 Cast Iron 150 Tool Steel Stainless 115 Brass 300 Aluminium 345 Wood 2400 Recommended for use with large arbor or large quick release arbor.