As my name suggests these are very nicely made mini clamps. The T-bolt springs are a nice touch that saves you from fumbling, and not all clamps have these. OTOH, those springs aren't long enough to provide pressure when the clamp knob is more than halfway out, hence my one-star penalty. If you use these clips a lot with thicker material, you can try stretching the springs by taking them out and spreading the ends, or maybe find longer springs.