An assortment of internal retaining rings from The Hillman Group. Retaining rings are used to secure parts onto shafts. They fit into grooves in the shaft for a snug fit. Proper fit determines reliability and proper functionality. Variants included in this assortment range from 3/8" to 1-3/4" in diameter. Full assortments of #45994 contain fifteen (15) refills comprised of Hillman item numbers #2184 - #2190, #400504 - #400508, #400510, #400513, and #400516.