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 66 Cast Iron 45 Tool Steel Stainless 30 Brass 90 Aluminium 90 Wood 800 Recommended for use with large arbor or large quick release arbor.