If buying 2nd hand, the Nemesys should come with 2 receiver bolts, (bit like a wheel bolt but with a hole at one end that the lock fits into) an adapter tool to enable the bolt to be fitted and removed with a hex socket, and of course 2 keys. The receiver bolts are 2 different lengths. You should also have some washers to fine tune the fit. These are all available from the makers separately if needed. The bar that goes into the wheel opening should also have a sponge cover to protect alloy wheels.