An assortment of manifold automotive studs & brass nuts from The Hillman Group. Automotive studs are a headless bolt that is threaded at both ends with the center portion remaining unthreaded. They are used to insert one end into the head or block and then insert a nut or washer on the other end for applications such as bolting the exhaust manifold to the head. Variants included in this assortment come in fine 7/16"-20 and coarse 3/8"-16 & 7/16"-14 thread sizes . Full assortments of #45950 contain six (6) refills comprised of Hillman item numbers #403483 - #403488.