1502 Series 4mm ID Spacer (6mm OD, 22mm Length) - 4 Pack, 1502-0006-0220

Create distance between parts, reduce a bore size, add a shoulder to a bolt, mount a bearing, or use as a lightweight shaft. Aluminum spacers have tons of uses, and having a variety of sizes on hand while building might be just what you need to tie up the loose ends necessary for the completion of your robot.