Must Have if you Don't 100% Trust your Machine Clamps
I bought a pair of these because the glide bar fixed clamps on my drop-weight were a bit iffy, and I had a hard time finding new ones. These were a godsend because I could string with the old clamps without losing tension, and without spending a bomb. I no longer use them as I bought a crank and upgraded to the Pro's Pro three prong clamps I bought here (awesome!), but i will pass them on if a friend of mine has the same issue. Four stars instead of five because I think they could open a bit further, but all in all, a terrific little clamp.