OIL Pump Primer Tool 1/4 Hex Ford Engine 289 302 390 428 NOW RETOOLED --Prime lubricating system of rebuilt engines to prevent damage of dry start It works by connecting to the oil pump shaft through the distributor hole and inserting in oil pump. For use with any hand drill. Black Oxide finish Triangle Shaped Drive End to eliminate drill chick slippage Aluminum bushing to insert in manifold for centering of tool