CURT Mfg Weight Distribution Head - For Tow use with Trunnion Bar Weight Distribution Hitches System .Looks to be the 12,000 Lb. Model. Fully Adjustable Drop or Raise Shank for Height and Angle or Pitch (last picture I'm pointing at those areas). Pictures also show this style has the upper Steel lever for the Weight Supporting Spring Bars .Shank is Solid Steel for 2" Truck Receiver and Has a 2" Trailer Ball, probably usually used with a 2-5/16" Ball for a TAG heavy Race or Service Untility Work Trailer Towing. Call (952)854-5 seven eight six