FSA Micro ACB Grey Seal 36x45 Stainless 1-1/8 Headset BearingThe FSA Micro ACB Grey Seal 36x45 Stainless 1-1/8 Headset Bearing fits zero stack headsets that require angular contact. The inner dimension is 30.2mm while the outer dimension is 41mm. The bearing is 6.5mm thick. Sold one at a time.400310019592