I got these clamps at a moving sale and have never personally used them. 5 of them say Kant Twist on them and the one is the upper middle doesn't have a name. I twisted the threaded parts on them a few turns and they all turned but the one in the lower middle is sticky and is harder to turn.
I got these clamps at a moving sale and have never personally used them. I spun the threaded part on both of them about a half an inch. One has some resistance and didn't spin smoothly and stopped so it may have problems with the threads and need to be repaired.
The Irwin Record 135/2 Sash Clamps are heavy-duty clamps with a bar section of 32 x 6mm (1 1/4 x 14 in). The slide and head are guaranteed unbreakable and the slide is secured by a solid steel pin passing through one of the locating holes spaced along the steel bar. The steel main screw applies pressure quickly and smoothly through a fast acting, hard-wearing rolled thread.
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