Review on Inches Double Split Collar Screws by Rene Putman

These clamps fit my bench grinder with a 1/2" shank perfectly and still hold up well. Seems to be decent quality too. However, as another reviewer pointed out, you need a 9/64 bit to tightening a hex bolt and most hex wrench sets don't come with this size.Fortunately I was able to find another style that worked.I'm deducting a star for that alone.