This is a " 4 degree shims 3" wide w/3/8" center pins (pair) " made by Tuff Country and is being offered by Top Gun Customz . If you have any questions pertaining to this product, please contact us Toll Free at 1-877-274-9362. Product Description: Degree shims are generally installed between rear leaf springs and the axle. Designed with a taper to rotate the rear axle to help eliminate vibrations that can sometimes occur in lifted vehicles. 3" wide Includes 3/8" extended center pins w/nuts Rotates rear axle to help eliminate vibrations We sell and install the full line of Tuff Country products as well as many other Top brands.