Small Hole Capacity- to a minimum of .430. High Performance- Positive rake for fast material removal, as will as finishing. Rigidity-Bar made of heat treated, precison ground alloy steel. Insert Locking- The insert is securely held with the Torx screw to reduce tool slipping. Chip Control- Advanced precision chip clearance allows for maximum boring capacity. Inserts - TiN coated with added chip breaker.