The Topeak Super Chain Tool is just what you need to install, remove, and repair single-speed and multi-speed chains. In fact, it's compatible with anything out there except for Campagnolo 11-speed hollow pin chains. Included is an integrated chain hook to ease in assembly as well as the popular 5mm and 6mm Allen wrenches for other road-side or trail-side repairs. This tool is sturdy enough for home use yet compact enough to bring along when you ride. Chain tool compatible with all single-speed and multi-speed chains except Campagnolo 11-speed hollow pin Integrated chain hook holds links during assembly Includes 5mm and 6mm Allen wrenches Steel tools and body are super-strong and built to last Plastic clip holds pieces together Dimensions: 7.6 x 4 x 1.9cm/3.0" x 1.6" x 0.7" Weight: 65g/2.29 oz