Material : Holder: Shank with high-strength zinc alloy balls (spherical surface hardness): Hv650 or more Shank with balls (shank): S35C (colored chromate treatment) <br> Boots: NBR special synthetic rubber
Material : Holder: Shank with high-strength zinc alloy balls (spherical surface hardness): Hv650 or more Shank with balls (shank): S35C (colored chromate treatment) <br> Boots: NBR special synthetic rubber