This trailer ball mount has a 4" drop and a 3" rise.  This is the heaviest duty ball mount that we offer.  It has a towing capacity if 15,000lb !  It can hold tongue weights up to 1,500lb.   It is manufactured by Curt mfg.  It is made of SOLID forged steel.  The hole where the ball goes measures 1 1/4" in diameter.  The shank is 2" x 2" square and the shank length is 9 1/2".  The hitch pin hole is 5/8" in diameter.  This fits most standard hitches.  It has a black powder coat finish so it will stay looking like new.  All ball mounts by Curt mfg. are fully tested and certified by an independent lab.