The lock is combined with 3 digital lock & chain. It is protected by vinyl sleeve. The lock can be used to lock all brands of bikes (bicycles). This type of chain lock can be used to lock gates for gardons or yards. They can be also used to lock machinery & equipments for sectury. Chain locks are used only for sectury, please don't use it for lifting or towing purposes. Custom-made is available in our factory. If you have any special requirement, please don't hesitate to contact with us, we will do our best to meet your request.