This Lock is a replacement barrel lock for the following clamps: HD1 Original Wheel Clamp for Steel Wheels HD2 Original Wheel Clamp for Steel Wheels HD3 Original Wheel Clamp for Steel Wheels HD3L Original Wheel Clamp for Steel Wheels HD4 Original Wheel Clamp for Steel Wheels SAS Trailer Wheel Clamp SAS Supaclamp (oval lock) – Clamp discontinued but consists of 2 red arms that fit together with an allen key and locked in place with this oval lock. Supaclamp Duo Wheel Clamp If you need clarification of the lock you require, please send us a photo of your clamp and current lock (if you have it), and we will advise further. The lock number will be supplied at random for this listing, if ordering multiple locks key numbers supplied will most likely differ. If you require more than the one lock, we can supply multiples on the same key number with the keyed alike option. This will mean the same key will open all locks, making it easier to use.