Cambelt idler to suit Ford Zetec Black top 1.6/1.8/2.0 and the ST170 engines. This is similar to the WRC Focus item. This replaces the std plastic item. Available with either 60mm (std size) roller or 70mm for blocks and heads that have been machined as the tensioners run out of adjustment. Straight forward replacement, no other parts required. Uses 316 stainless steel hub with 2 high quality roller bearings with cnc machined alloy belt roller circliped together for replacement of bearings if need be. Ideal for high rpm rally or race engines. PLEASE SPECIFY SIZE REQUIRED