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 220 Cast Iron 145 Tool Steel Stainless 110 Brass 290 Aluminium 330 Wood 2100 Recommended for use with large arbor or large quick release arbor.