The Topeak Super Chain Tool 13S is a compact, high-quality chain tool designed for single-speed and multi-speed bike chains up to 13-speed, including Campagnolo(R) hollow pin chains. Constructed from durable cast CrMo steel, this versatile tool delivers long-lasting performance for chain maintenance and repairs. Integrated 4 mm and 5 mm Allen wrenches, a chain hook, and convenient storage features make it an essential addition to any cyclist's repair kit. FEATURES: Compatible with single-speed and multi-speed chains up to 13-speed Durable cast CrMo steel chain tool construction for long service life Works with Campagnolo(R) hollow pin chains Includes integrated 4 mm and 5 mm Allen wrenches Steel wire chain hook assists with chain installation and repair Built-in clip keeps tool components securely together Features chain hook holder, chain pin holder, and chain pin breaker