The MT21 is a multi-tool for cyclists offering a plentiful assortment of 21 bicycle tools: 7 allen keys, 3 screwdrivers, 3 torx wrenches, 4 spoke keys, a chain tool, a handy bottle opener, the Brooks saddle spanner and a knife. 7 Allen Keys / Hex Wrenches: #2, 2.5, 3, 4, 5, 6, 8 3 Screwdrivers: -Small Flat Head Screwdriver - Phillips Screwdriver #2 (Medium Head) -Phillips Screwdriver #1 (Small Head) 3 Torx Wrenches: T10, T20, T25 - 4 Spoke Wrenches: #0, 1, 2, 3 - 1 Chain Tool, 1 Bottle Opener, 1 Spanner for Brooks saddles and 1 Knife.