Durable ball mount Requires only one wrench for tightening when used with Interlock tow balls No more marring your hitch ball when tightening Patented hexagon shaped bases fit together and hold stationary Standard hitch balls and drawbars may also be used with Interlock products but require 2 wrenches for installation Solid steel with a Metal Shield finish that resists rust and corrosion Metal Shield consists of a zinc-phosphate based coating, followed by a secondary Powdercoat layer for superior protection 300 to 3500 lb capacity 2-1/2 drop 2 rise