Socket clevies is forgeable iron,hot galvanizing.Spring catch bronze or stainless steel.

碗头挂板为可锻铸铁件，。弹簧销为青件或不锈钢件。

For processing the high tensile metals:carbon stell common alloy stell,hard bronze forgeable castiron.etc.

高抗张强度的金属:碳素钢、硬青和可锻铸铁等。