The Feature:
1. The Pilot Bits select the ASTM4140 material.
2. Hardness: HRC38-42
Application:
The RP4 pilot bits with holder mostly using for drilling auger and bucket. they can suitable for the 38/30mm round shank chisel bits, such as B47K17.5-H, B47K19-H, B47K22-H, etc.
