Description: 1. Made of high-carbon steel for durable and hardness HRC 48-52 grade. Surface with electrophoresis rustproof and long time service. 2. Automatic strong spring reset locking function automatic locking bite when you use the tool to lock the smooth pipe easily and quickly use. It is suit for screw nut pipe and etc.. 3. The precise ribbing dual teeth of the wrench that can grip pipes securely and tightly. The crowbar-designed at the bottom of the wrench provides a useful way to prize up the object. 4. Ergonomic TPR plastic-dipped handle can provide comfortable working griping force that save your strength and suit for long time working. Specifications: Materials: 45 High Carbon Steel Hardness: HRC48-52 Opening Range: S: 14-30mm M: 30-60mm Length: S: 26cm M: 38cm includes: Choice 1: 1x Wrench Choice 2: 2 x Wrench