The screw claw is embedded in the chuck. The nut is equipped on the chunk. The sizing board with an arc is connected with the screw claw by a bolt.

主要由丝爪、螺母、卡盘、定径板组成，丝爪镶嵌在卡盘内，螺母装 在卡盘上，带有弧度的定径板通过螺栓和丝爪相联。

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When the split bolt is in use, templates (81, 82) are fixed by the nuts (11, 12), claw glands (61, 62) and scaffold tubes (71-74).

使用时，由螺母（11、12）、羊角压盖（61、62）和 脚手管（71～74）将模板（81、82）固定。

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