This CURT adjustable channel-style ball mount has a shank size of 2 Inch x 2 Inch and features two different trailer ball sizes to accommodate two different coupler sizes: 2 Inch and 2-5/16 Inch. It also features an adjustable shank assembly with multiple mounting holes for varying ball heights. Each trailer ball can be raised to a maximum of 5-1/4 Inch rise or lowered to a maximum of 6 Inch drop, allowing you to make your trailer completely level in any towing situation. The channel-style design and dual-pin mounting system also provide a built-in anti-rattle feature to eliminate obnoxious chucking noises. This CURT adjustable ball mount offers a gross trailer weight capacity of up to 10,000 Pounds for the 2 Inch ball and 14,000 Pounds for the 2-5/16 Inch ball. It allows you to tow a variety of heavyweight trailers, and it features two pin holes in the shank to be mounted at an 11 Inch or 12 Inch length. The adjustable channel-style shank can also be used with the channel-style combination pintle mount or ball mount platform attachment to give you the option of installing your own trailer ball size. All CURT channel-style adjustable ball mounts are made with sturdy steel construction and come with our black carbide powder coat finish for long-lasting rust, scratch and UV resistance.