它是个上端为钻杆母扣或者由壬，下端为套管公扣，内空心的转换接头。
Its upper end is drill pipe box or union, the nether end is casing pin. It is a crossover with hollow inside.
它由公扣和母扣组成，公扣的外周设有安装环槽，公扣的一端设有凸出部；
The periphery of the male buckle is provided with an installing ring groove, and one end of the male buckle is provided with the bulge.
公母扣同时自动送料。脚踏开关控制。给予准确下料。铆合漂亮。速度快。操作安全。
Automatic rivet feed, foot switch control. for accurate cutting. riveting. beautiful. fast. safe and easy operation.
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