Jorgensen 33418 ISD-3 18-Inch One-Handed Clamp
18-Inch Jorgensen ISD-3 Bar Clamp.  The first bar clamp to expand by joining two clamps together with no tools or added accessories needed.  The patented head design allows any two Jorgensen ISD-3 Bar Clamps to be joined together for greater clamping capacity.  By quickly flipping the head 900 you join two clamps together and also increase total clamping capacity by 6-Inch over the original two clamps.  Example:  Two 12-Inch Bar Clamps joined together will give you one clamp with an 30-Inch capacity.  With every two clamps you buy, it's like getting a third, larger clamp for free.  Features also include 76% More Clamping force than our competition, new quick release knob for fast, easy changeovers, and dual durometer handles for a comfortable grip.  The Jorgensen ISD-3 Bar Clamp head can also be reversed for spreader function.