The Bessey DUO16-8 6" Bar Clamp is a must-have for anyone who works with metal. It can be used to clamp or spread the front, side, and behind the rail. The bar clamp features a 1 hand pump action that converts with a turn of a knob. Removable/reversible pressure pads allow you to make adjustments easily. This high quality bar clamp has heat treated steel as its bar material and reinforced polyamide as its handle material. With a max jaw opening of 6", throat depth of 3 1/4 in., spreading range of 3 to 9 in., and capacity of 6 in., this tool will meet your demands easily. The Bessey DUO16-8 6" Bar Clamp is easy to use and built to last so you will want it on hand for your next project.