I went out and bought a 12" 512QC Quick-Grip Bar clamp/spreader just  a few days ago and felt I should have bought it a long time ago. I can do  most of the clamping with one hand now. I am not a professional but this  tool let me do my work much x faster. The grip is very strong. In one click  you can loosen it and the other handle on top tightens it. The Rubber grips  protects wood from being damaged. You don't need to insert anything between  wood and the grip. I want to buy the bigger length ones when the need  arise. Also this is very lightweight and strong. I think every wood working  enthusiast or pro should have it