I bought these for cases where a traditional end clamp would not hold the allen screw blank, when the joined parts were different widths and will not sit flush on either side. I was a little skeptical as I had never heard of this brand before but the price seemed great compared to the manufacturer that makes my drill press and drill bit blades. The clamping depth of this size was greater and suited every type of part from my 1/2 and 3/4 plywood projects to large 2x4 assemblies. Hand. Overall I found them reliable and easy to use. Bonus points for a large knob that is easy to adjust when the clamp is secured to the workpiece, which I need because I'm bad at guessing clamp depth by eye.