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.
当公标尖端部的第一台阶处折断后，尚有棘刺形的第二台阶与母标相扣合，避免了掉标的可能。
After the first step of the tip part of the male mark is broken off, the second thorn-shaped step is buckled with the female mark, which avoids the possibility of mark falling.
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