I already installed the pulley so I can't get measurements of it. I know it's 70mm outside diameter, and the same inner bearing diameter as the stock 4.4 tensioner pulleys. It's probably 2mm thinner (width wise) on both the bearing and pulley surfaces then a stock 4.4 tensioner pulley. It's only $15 so you don't have much to lose... You can take it back for a refund if you don't damage it.