An assortment of external retaining e-rings from Hillman. Retaining rings are used to secure parts onto shafts. They fit into grooves in the shaft for a snug fit. The external e-rings in this assortment come in variants running 3/32" thru 1" in diameter. Full assortments of #45992 contain sixteen (16) refills comprised of Hillman item numbers #871 - #878, #398537 - #398541, and #398550 - #398552.