Here we have a black molded plastic timing belt sprocket with a one-way roller clutch buried inside of it. The sprocket is for a round tooth metric timing belt with 26 teeth, an OD of 23.8 mm, a face width of 20 mm, a flange on one face, and a thru-bore width of just over 22 mm. The real attraction for this item is the drawn-cup roller clutch thats pressed into the molded plastic hub. The clutch is designed for an 8mm shaft, and is 12mm OD and 22mm long. Here's a link to the bearing manufacturer's website: http://medias.schaeffler.com/medias/en!hp.ec.br.pr/HFL*HFL0822;bGGGO5YcNjH9. The bearing clutch itself is selling elsewhere for $19.49 each.
