2 OIL PUMP PRIMER TOOLS, 1/4″ and 5/16″ Hex drive end for FORD PMD PRODUCTS BRAND Fits popular engine of 289, 302, 351W 351C, 390, 428, 429, 460 cubic inches Designed to prime the lubricating system of a rebuilt engine prior to its first start to prevent the damage of a dry start. It works by connecting to the oil pump shaft through the distributor hole and inserting in oil pump. For use with 3/8″ hand drill. Black Oxide finishTriangle Shape Drive End to eliminate drill chuck slippage on shaft1 Primer has Centered 1/4″ Hex cut out in the tube to eliminate shaft wobble Other primer has Centered 5/16″ Hex cut out in the tube to eliminate shaft wobblePrecision Aluminum bushing to insert in manifold for centering of tool Shipping determined on the shipping tab above, will combine orders, will ship international See our auctions for Flex-Hone Honing Tools, all sizes and grits, Honing Oil, Cylinder Wash Brushes