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For use with any standard one inch bar. Actual bore size -1.028". Two set screws per collar to bite down and hold on. Each set of collars comes with an allen wrench to loosen and tighten the collars.
Posted by David D. on 27th May 2010
These may seem like simple little things, but they are simply the most effective collar I have ever seen. The double-set screw design means you barely have to tighten both screws to get a good strong hold without scoring or damaging the shaft you're tightening them on to.
Excellent design.