I ordered two couplings from 6mm to 6.35mm. One came the right size. One came in the wrong size 5mm x 5mm Also the correct one came in an anti static bag, the wrong size clutch didn't come not that it mattered much but something to watch out for, luckily the dimensions were that I needed could be easily reamed out with ordinary imperial bits (1/4" for 6.35mm and 15/64" for 6mm in case you need to do the same). My DID came with pins/set screws, which I'm happy with. Other reviews Say they didn't, I was worried about that. Overall decent quality. Holes seem to be quite concentric.
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