The super enthusiasts' multi-tool The most common hex wrench size on a bike is a 5mm so we made the driver for the chain tool a 5mm with a 5.0 x 0.8mm flat blade screwdriver on the other side. All the limit screws and most accessory screws accept a flat blade screwdriver and 5.0 x 0.8mm is the most common size. Also has spoke wrenches on the handle of the chain tool to get the wheels spinning between the brakes after any mishaps. The 5mm hex/screwdriver has convenient holder to keep things from being misplaced. 5mm hex key & flat-bladed screwdriver with chain tool and 3.2, 3.3 and 3.5mm spoke wrenches. Made of heat-treated tool steel. Easy to use, yet so small, there's no excuse not to carry one. Weight: 80g