IRWIN 225134 C-Clamp 3-Inchx4-1/2-Inch Deep Throat - 100 Series

• IRWIN 225104 100 Series 4-Inch C-Clamp
• IRWIN 225102 100 Series 2-Inch C-Clamp
• Jet JW1044 4-Inch to 2-1/2-Inch Reducer
• IRWIN 225108 100 Series 8-Inch C-Clamp
• AO Safety 95190 Woodworker's Respirator

So far they have not distorted and have stayed true and square. Maybe on bigger C-clamps but on this size I do not notice them being any slower than an Adjustable brand clamp. So far I have only had satisfactory results. I was a bit worried when I noticed that some of the other Irwin C-clamps were getting low ratings. When you look at this clamp it looks beefy for its size and the color is nice to look at compared to bare steel of other clamps.

But so far I have had nothing but good luck with these clamps. The twin thread design is supposed to help clamp things tighter. I have not noticed much improvement, but maybe that is because I am comparing them to 8" clamps of the same throat clearance and not 3" clamps. And some people complained about slow adjusting on the threads.