You are purchasing a New GSRF,  Loc-it coupler lock Housing for a 2 5/16 ball coupler.  AsThis is for stamped couplers only. Will not fit cast or forged couplers.  you can see, this body of the coupler lock is 1/4" thick on the housing.  This is a very secure way of locking the coupler on the trailer, so thieves have no way to tow your trailer away.   This does not fit Slide Lock Couplers !!  This lock comes with Free Shipping to the lower 48 states. A 90 day Factory Warranty included.  Made in good old USA.  Does Not Fit UFP Couplers !!  FOR SALE IS LOCK HOUSING ONLY, ....NO PUCK LOCK INCLUDED...