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 275 Cast Iron 180 Tool Steel Stainless 140 Brass 380 Aluminium 410 Wood 2400 Recommended for use with large arbor or large quick release arbor.