You are looking at a Loc-it Slide lock coupler lock. This housing will cover not only the coupler, but also the slide. This lock fits Bulldog Fulton couplers ONLY, channel and A frame. This will not fit Ram or Curt couplers that have a pointed nose. These are of Heavy-Duty Steel Welded Construction. The locks are made of 304 Stainles Steel and are bolt cutter proof. These are anti-rust and corrosion resistant and can withstand all types of weather. The only way to remove this lock is by cutting torch and electric cutting tools. The square housing is where the locking to the coupler is done. This will be secure even if slide is in the open position. This is a very secure lock for these couplers. Not for locking up chains.The housing is coming with 304 Stainless Steel Lock with 2 keys, and the tube is enamel painted. Can be repainted your color. Comes with a 90 warranty from the manufacturer to cover manufacturing defects. There is FREE SHIPPING to the lower 48. All material is made in USA. Check out our other listings for the lock you have. Channel, stand, and coupler are for display ONLY, the sale does not include these mentioned. NO INTERNATIONAL SHIPPING...PLEASE