We believe this to be a Honda adjustable cam sprocket Cam hub has a .790" bore with a .160" wide keyway, pulley is 1.100" wide, 33 teeth and up to ten degrees advance or retard for timing adjustments. Both parts are anodized and pulley is new never installed.
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.