This is a black anodized aluminum sprocket hub by Kart Master.
This hub is compatible with any #35 and #219 sprocket.
They are slotted for a 8mm key. Double Pinch Bolts.
It is one item in karting that is universal for all chassis manufactures.
Collections: Axle Assembly, Chassis, Eligible For Coupon, Products, Sprocket Hubs, Sprocket Hub Hardware