Variable tooth unique variable tooth geometry for consistent cutting ability in a wide range of materials Manufactured to strict Alpha specifications to suit demainding Australian conditions 8% cobalt Bi-metal gives ultimate performance and superior welding technology prevents tooth strippage 38mm cutting depth Recommended Speeds Mild Steel 115 Cast Iron 75 Tool Steel Stainless 55 Brass 150 Aluminium 170 Wood 1500 Recommended for use with large arbor or large quick release arbor.