... CE,ISO9000,National Invention Paten SPECIFICATION 1. Main material: environmental aluminum alloy, with advantages of firm, not easy to ... compactness without deviation; 6. Drive shaft: solid-core aluminum shaft with diameter of 2cm, the twisting force is ... of divers of triangular prisms made by special aluminum alloy,Controlled by micocomputer, joined by motorshaft ,driven by cam or motor ,each trianglar ...