High Performance : Minuteness technology , close nesting , accuracy hex shape , closed toroidal full bite . A great tool for emergency need while riding . Manufacturing Material : Made of high quality zinc alloy material , for long-lasting , strong , non harm , rustproof , which undoubtedly effectively prolong its service life . Unique Bone Shape Design : Unique bone shape design , compact size and lightweight design , easy to carry , won't take up too much space , can be stored in your tool bar , tool bag , pocket , etc . Purpose : Common wrench size for turning a certain size nut or bolts , universally fits for repairing many types of bikes . 10 hex holes in sizes from 6mm / 0 . 2in to 16mm / 0 . 6in . Easy to Use : Easy to use and fine workmanship . Without any difficult requirements even though you use it for the first time .