A kind of definite- purpose double-head wrench to assemble the junction box of the explosion-proof motor was introduced. This double-head wrench was com-posed of the hexagonal socket and double-head connecting rod, capable of turning within 360°to tighten up or loose down the screw conveniently.%介绍一种专用的双头扳手，特别适用于一种防爆电机接线盒座的装配。该双头扳手由内六角套筒与双头连杆组成，可以轻松实现n×360º的旋转，很方便拧紧或拆卸螺钉。
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