Clamps around tubing, eliminating the need for welding on the chassis. Accepts Pro-werks Bottle Mounts, Universal Clamps, and Neck Mounts when attachment to round tubing is necessary. Ideal for add-on accessories such as fuel pumps and electronic devises. Mount base is 3-1/2 wide end to end and the 1/4 bolt spacing is 2-5/8, measures 1/2 thick.