RK Chain T101 Black Breaker Press Fit Chain and Rivet Tool Quickly and easily breaks 40 & 50 type chain Easily press-Fit for: tight tolerance 40,50 & 60 O-ring chain sideplates to the correct depth for clip or rivet link installation. Flares RK's special pin hole rivet links to the proper dimension to secure sideplates in place. Works on most brands. Replacement parts available.