D2O Alloy Headset Spacer - 1 1/8 Inch - Black

Disappointing that the outside diameter was different to other spacers from the same supplier, bought at the same time. I bought 20mm, 10mm, 5mm and 3mm spacers. The 20mm and 10mm were the same OD. The others were different to this and different to each other. Thus, they don't make a neat stack.

I recommend this product

You don't need to ask much of a spacer ring, but this one is well finished and fits perfectly.