For Breaking and joining most drive chain from 35-630 This tool will break and rivet 420-630 rear drive chains. For chain #520 and up, it is recommend to grind the rivet head Pin Guides 2.2mm Upper and 2.2mm Lower and Riveter Pin Be used on cam chain to drive chains or as a chain breaker by pushing the pin out Features: This tool is designed to rivet chain links to form an endless chain and is versatile enough to be used on cam chain to drive chains or as a chain breaker by pushing the pin out. This tool will break and rivet 420-630 rear drive chains. For Breaking and joining most drive chain from 35-630. For chain #520 and up, it is recommend to grind the rivet head. Recommended for light to medium duty use. This is an essentail tool, no motorcyle mechanic should do without it. Tools are brand new in box. Tools are lubricated oil to keep tools from rust by factory.