Lead acid batteries in automobiles, pickup trucks, tractors, and heavy equipment emit corrosive gas that can erode and damage the OEM battery's hold down bracket and J bolts allowing an unrestrained, heavy battery to slide around creating a hazardous situation by allowing the battery to tip over and/or rupture or break allowing sulfuric acid to be released. Tech Team's Adjustable Battery Hold Down Set can solve this problem. The set consists of an acid resistant epoxy coated cross battery brace / bracket / clamp that can adjust to fit batteries from 4.5” to 8.626” in width and 2 11” 8mm diameter zinc plated J bolts with 3.5” of M8 x 1.25 thread with wing nuts and washers. The J bolts will support batteries from 7” to 10.5” inches high. To install the hold down first disconnect the negative terminal of the battery and make sure you are wearing rubber gloves and eye protection then remove the old hardware. Now put the J bolts through the appropriate holes, put the washers in place, and thread on the wing nuts about 5 – 10 revolutions, put the hook of the bolt in holes in the battery tray or under the edge, fit the bracket to the battery, adjust the width, and then tighten all the wing nuts. Installation is a simple process on most applications but there are always exceptions. With that thought, it's a good idea to review the detailed drawings that we have provided and compare them to your particular requirements. Keep in mind that in some situations you may need to drill or adjust the battery tray/pan so that the J bolts can make a solid connection. Includes one (1) battery hold down and hardware.