Product Description: The ROP Shop replacement (Pack of 2) Flat Idler Pulley for TimeCutter SS 4225 74721 Riding Mower Specs – Inside Diameter: 3/8″. Outside Diameter: 4 1/8″. Height: 1 1/2″. Refer to images 2 & 3 for more information Includes – (2) Flat Idler Pulleys; comes as shown in the first image Please be sure to check your part or model number to ensure this is the correct flat idler pulley for your unit. Also, please note this may replace multiple part numbers