5 carbide blades with 3 angle profile, will cut a 3 angle seat in one pass!New and improved design to be used with "New3Acut" 45° cutter heads, the new design blades are suitable to be use with any powered or hand drive method; A basic seat and guide machine or Bridgeport type mill are recommended for faster work and accuracy, with practice,very good results can be achieved with a "T" handle, limited only by the hardness of the seats you are working on. Note: These blades are designed to be used with "New3Acut" 45° cutter heads only, a form tool setting fixture is a must to set up blades on cutter head.