The Neomounts ABL-875 is a brake lock for the caster wheels of the FL50S-825 and FL55-875 carts. To prevent unwanted movement of the cart, the dual wheels can be locked using the ABL-875. The locks can be easily attached to the cart's wheels (padlocks not included), preventing the brake from being released. The bright blue color is a clear indication to the user that the wheels are locked. The ABL-875 comes in a set of 2 brake locks.