This pulley is used on the Lister CS water pump kits but due to requests for just the pulley from these kits we have made it available separately. Designed for a 2" diameter shaft and an A Profile V belt. From feedback we have received this pulley lends itself quite nicely to driving an automotive type alternator from your CS. Don’t forget we have access to a huge range of power transmission components, if you cant find what you are looking for please contact us with your requirements. We will be only too pleased to help.