Ford Zetec 1.8 / 2 litre / ST170 Blacktop cambelt idler pulley. This bolts to the std or after market oil pumps using the tapped hole provided. This idler is 48mm diameter and helps guide the cambelt at high rpm as per ST170 engines. Comes assembled with replacable bearings inside alloy roller with stainless steel hub. Comes with bolt and washer. No modifications required to fit. This will work with all std parts or our tensioner and idler.