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 165 Cast Iron 110 Tool Steel Stainless 80 Brass 220 Aluminium 245 Wood 2000 Recommended for use with large arbor or large quick release arbor.