These are entirely different to the widely available white Hex plastic(styrene) jobs.
The attached pic shows the same length of material being tightened on the white ones. I think it is self explanatory.
Mine are 1 3/8" or 35mm (they can be halved if you're using with spacers) and drilled for 1/8" or 3/32" rod.
£1.25 each shown in packs of 10 but you can have what you like.
Nylon 101 is currently the strongest material for machining on the market.
The last ones went to Paul Brennan in Ireland, his had to be drilled slightly differently as Zum use an in-between rod size. I'm sure he won't mind me saying he was thrilled with them and told me he had got back some good licks when it got back to full compliment!



