Pack Pliers Multi Tool with 17 function 8mm hex head has 4mm insert, each with 8 included hex bits. The ball detent swivel head handle also doubles as a breaker bar to help you access to places you can't reach. Spoke Wrench, Valve Core Wrench, Hex Wrench (0.08, 0.1, 0.1, 0.2, 0.1, 0.2, 0.2, 0.2, 0.2, 0.2 inch (2.5, 3, 4, 5, 6, 8 mm); Torx Wrench (T10, T25), Flat Head Slotted Screwdriver (3.5 mm) / Phillips Type Screwdriver (2 mm) / Master Link Attachment of Valve Stem Lock Nut Attachments are stored) Compatible with 9, 10, 11, and 12 speed master links and chains (not compatible with Campagolo 12 speed chains) Master link storage is compatible with SRAMPowerLockLink, ShimanoQuick-Link, KMCMissingLink, and other similar master links. (Wipperman ConnexLinks) Material: 7075-T6 aluminum handles, CrV tool Steel Swivel Head, S2 Tool Steel Bit; Weight: 2.6 oz (68 g); Size: 5.7 inches (146 mm) (Length x Width x Thickness) 0.8 inches (20 mm) x 0.4 inches