Bicycle Chain Breaker: High-quality cast steel, comfortable plastic handle, and 42CR steel threaded push pin deliver high, reliable performance time after time. Ergonomic handle for comfort and ease of use. You can choose between two models. For 5-9 Speeds: Adjustable set screw makes the bicycle chain tool compatible with all chain widths. Compatible with 5-6-7-8-9 speed chains (for Sram, KMC, and Campagnolo), as well as 1/8\" and 3/32\" single-speed chains. For 5-12 Speeds: Adjustable set screw makes the bicycle chain tool compatible with all chain widths. Compatible with 5-6-7-8-9-10-11-12 speed chains (for Sram, KMC, and Campagnolo), as well as 1/8\" and 3/32\" single-speed chains. Precision Work: Bicycle chain breaker for cutting and riveting your bicycle chain easily and with precision. Accurate chain rivet press, with centering screw and chain lock, so you can precisely push out and in the chain rivet. Easy to Use and Replacement Pin: extra long lever, high-quality threaded pins. Smooth and powerful pressing, even the most stubborn chain link can be successfully separated.