High-quality, long-life chain tools made of cast CrMo steel for single and multi-speed chains up to 13 speeds, including Campagnolo® hollow pin chains. Includes 4 and 5 mm Allen keys and chain hook. TOOL MATERIAL Hardened steel TOOLS CrMo steel chain tool, 4 / 5 mm Allen wrenches, steel wire chain hook SIZE 7.9 x 4.2 x 2.1 cm / 3.1" x 1.65" x 0.8" WEIGHT 66 g / 2.33 oz ADDED FEATURES Chain hook holder, Chain pin holder & Chain pin breaker