CONNEX chain10-speed, 1/2´´ x 11/128´´self-service package, with a width of 5,9mm these chains are compatible with all current 10-speed-derailleur systems.High quality materials and the extremely outer link guarantees long life and outstanding shifting performance.The stainless steel inner link of the models 10s1 and 10sX offer a much better protection against wearness which spares the expensive sprockets.With attached Connex link you can mount or dismantle your chain quickly - all without tools! bolt length 5,9mm