The Aventon Chain Lock offers a heavy security option for your electric bike. With steel chain links warpped in a durable nylon sleeve, this lock offers robust protection while keeping your ebike&';s finish prestine. Including two keys, this lock is a neccessary accessory for keeping our bike safe! Specs Lock Thickness 0.3in (8.3mm) Material: Nylon casing with steel chain link Weight: 5.5lbs (2.4kg) Dimensions: 47in in total length