An assortment of unthreaded aluminum spacers from Hillman. Aluminum spacers are used to create space between two objects or surfaces in order to ensure proper placement. The corrosion-resistant aluminum construction is ideal for applications involving circuit boards, gears, panels, and doors. Parts often used as bushings, bearings, rollers, or glides. Assortment includes parts measuring 1/4" and 5/16" in outer diameter and come in #6, #8, and #10 screw size varieties. Full assortments of #58397 contain twelve (12) refills comprised of Hillman item numbers #58398 - #58409.