Used one of these to replace the bearing ring on one of the drafting chairs we use as lab chairs. This is a big improvement. The extra size is nice, but the main improvement is that the clip actually works on this ring. Standard rings slipped off throughout the day no matter how you twisted the handle. This ring stays where I set it. With the latter, I converted one of my HumanScale Freedom chairs into an ultra-comfortable lab chair. ;)
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