Features： 1、Specification: Supports single speed, 2/3/6 internal and external variable speed. The chain regulator can easily turn multi speed bikes into single speed bike. 2、Manufacturing Material: Made of aluminum alloy material, hard and wear resistant, CNC processing, can adapt to harsh environment, light weight, will not bring extra burden to the bike. 3、Stable Speed Change: The bearing is placed inside the gear to ensure that when the guide wheel works, frame does not move, only the guide wheel rotates, making the speed change more stable. 4、Wide Applicability: Suitable for bicycle chain tensioning, can be used in mountain bike, road racing, fixed bicycle, single speed bicycle, etc. 5、Simple Operation: Simple to operate, easy to use, easy to install and disassemble. Without any difficult requirements even though you use it for the first time. Specification： Item Type: Bicycle Chain Tensioner Weight: Approx.100g / 3.5oz Material: Aluminum Alloy Specifications: Supports Single Speed 2/3/6 Internal And External Variable Speed Package List： 2 x Fix Regulating Wheel Screws   1 x Chain Tensioner