Features： 1、Manufacturing Material: Made of 45# carbon steel and chrome plated surface material, can be used repeatedly, easy to install and disassemble, not easy to scratch the hollow shaft wrench. 2、Minuteness Technology: Minuteness technology, close nesting, accuracy tooth shape, closed loop full bite, not easy to slip teeth. 3、High Hardness: 285mm / 11.2in full length, 4mm / 0.2in thickness, high hardness, suitable for all the hollow shaft in the market. 4、Multi Purpose: In addition, it is suitable for bicycle wrench, multi function wrench, and so on. Simple operation, no tedious steps. 5、Easy to Use: Easy to use and fine workmanship. Without any difficult requirements even though you use it for the first time. Specification： Item Type: Bicycle Hollow Shaft Wrench Weight: Approx.303g / 10.7oz Material: 45# Carbon Steel + Chrome Plated Surface Product Color: Frosted Silver Specification: Suitable For All Hollow Shaft On The Market Full Length: Approx.285mm / 11.2in Thickness: Approx.4mm / 0.2in Package List： 1 x Hollow Shaft Wrench