Features:
- Fast replacement composite cone・ uses drill edged principle- Drilling and tapping in one・ one-step processing・ greatly save processing steps and time costs・ improve working efficiency- Self-centering point・ do not need assistant center drilling or center punching- High hardness・ rustproof・ solid and durable- Size include: Diameter 4mm / 5mm / 6mm / 8mm / 10mm