Irwin makes a nice set of clamps. One hand to tighten and quick off. Like previous reviewers said, it actually grips better once the bar has some scuffs and wear. A must have for the shop.

I already had a pair of Irwin's mini slide clamps for small art projects. I recently moved up to larger projects doing more seious wood working. Since I live in an apartment, space is very limited. (I do my work outside on the deck. Too narrow and not strong enough for a real workbench.) So, adding the Irwin clamp set to my Black and Decker WM125 Workmate 125 Portable Work Bench made a huge difference. Their versatility in clamping and ease of use allows me to make much greater use of the Workmate workstation, including as a base for my Dremel 220-01 Rotary Tool Work Station.
I can clamp equipment in place, or, better yet, because of the ease of opening and closing Irwin's clamps, I can safely move a piece of material without taking my other hand off a tool or working piece.

I read lots of reviews, but rarely write them. I am a part time remodeler. I work alone lots of the time and could not do some of the jobs I do w/o one-handed quick clamps. They hold pieces plumb and level and tight together for fastening w/o a helper. This set is great for the price because you get 2- 12" bigger clamps with the ability to remove and heads and use them as a spreader (ie. push up and hold a length of fencing level, when working alone) 2- 6" thinner clamps (nice size to hold pieces of material for cutting etc)and the 2- small hand clamps which are handy for holding down plywood or a guide for cutting plywood. A useful assortment for a wide range of jobs. Get it when Amazon is having a sale and it is a "no brainer". You will be surprised at the uses you will find for these clamps. I have even used them for some glue-ups but pony clamps are generally better for that.

Clamps work well though one-hand operation of the features required to engage and disengage the clamps is a bit difficult on some models and of course one generally only has one hand free. As clamps go though these are some of the best I have used.

Only regret is that I didn't buy them sooner. Nice assortment, hold well and very handy.