Connex chain:- 1/2 x 11/128´´, 10-speed derailleur chainWith a width of 5,9 mm these chains are compatible with all current 10-speed-derailleur systems. High quality materials and the extremely outer link guarantee long life and outstanding shifting performance.The stainless steel inner link of the models 10s1 and 10sX offer amuch better protection against wear which spares the expensive sprockets. With attached Connex link you can mount or dismantle your chain quickly - all without tools! bolt length: 5,9 mm´´10sE´´, inner link stainless steel, outer links nickel-plated, with 124 links, extra long and reinforced E-bike-chain, weight: 275 g