This tool is designed for rivetting hollow-pin chain links, delivering reliable performance for chain maintenance and repair. Key benefits and features - Durable press pin: heat treated and hardened for long life and consistent rivet results. - Wide chain compatibility: fits chain sizes 415, 420, 428, 520, 525, 530, 630. Please verify pin sizes below to ensure the best fit. - Flush finish guidance for larger chains: for chains 520 and larger, it is recommended to grind the rivet head to achieve a smooth, flush finish. - Reliable performance: helps create strong, secure joints that withstand cycling stresses. 2-3 practical use scenarios - Road or commuter bike maintenance: rivet hollow-pin links on chains in the 415, 420, or 428 size range to restore smooth operation. - Mid-size chain assembly and repair: install or replace hollow-pin links on chains 520, 525, or 530 with durable, secure rivets. - Heavy-duty or field repairs: work on 630 chains when needed, ensuring compatibility by checking the pin sizes listed below. Note: Please verify the pin sizes below to confirm exact compatibility with your chain model.