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The Concave-convex Tools / Tools

The Concave-convex Tools
The Concave-convex Tools

Open-end wrench is the most commonly used wrench. But it’s easy for the wrench to slip away from the original position when using it to twist the nut/bolt, which may bring hand injuries. Compared with open-end wrench, ring wrench is far more difficult to hurt people. That’s because the contact surface between the open-end wrench and nut/bolt is smooth, while the concave-convex between the ring wrench and nut/bolt increase the friction dramatically.The Concave-convex Tools is made up of an open-end wrench, a bolt and a nut. There are six grooves on the bolt and nut, and two ridges on the wrench. In this way can people seldom hurt their hands.

University

Beijing Institute of Technology

Beijing Institute of Technology
Beijing, China

Design

Beijing Institute of Technology

Beijing Institute of Technology
Beijing, China

Yang Yang