This small, lightweight tool is a big help when it comes to replacing or maintaining your chain. Easily presses on and off master link plates for clip style chains. Lightweight billet aluminum construction with hardened steel pins for years of reliable use. Will not damage master links up to 24.8mm link width. Works on most 50 series chains, however it is not intended for use breaking rivet master links (but there are other tools for that). Use with a 6mm and 10mm hex wrench. 2”x3”x1.5”.