Sliding brackets for the VDO Sceptron allow you to fasten fixtures to a truss using a rigging clamp or to a surface or other structure using M12 bolts passed through the bracket. In some situations you can fasten the brackets to fixtures using the spring-loaded fasteners supplied with the brackets. In other situations you must remove the supplied spring-loaded fasteners and fasten the brackets to fixtures using M6x10mm bolts and self-locking nuts