A dovetailed iron tenon made of several parts and designed to fit into a dovetail mortise in a large stone so that it can be lifted by a hoisting apparatus.

• 起重爪，吊楔燕尾形铁榫，由几部分构成，可以拼拢嵌进一块巨石上的燕尾形榫眼，由此可通过一个起吊装置举起大石