Along with superior strength and durability, the CT-3 features a handy "loosening shelf" to remedy stiff links after reassembly. Like all Park Tool Chain Tools, it's easy to use and built to last, and has a replaceable driving pin. Works great on derailleur chain, even 9 and 10-speed chains. The CT-3 will also fit many 1/8" chain (BMX). 336 g.