uxcell 50pcs ABS Round Spacers Washers OD 7mm, ID 3mm, Height 2mm for M3 Screws Model: 7-3*2; Material: ABS Size: 7 x 3 x 2mm/0.28" x 0.12" x 0.08"(OD*Inner D*H) Package Content: 50(+/-2%) x Round Spacers ABS Spacers can have advantages over metal spacer they are lighter, donot rust and are less brittle , Those are also widely used in electrical products. It is used to protect the LED standing on the PC board, so that the height is consistent, the middle partition design, the joint angle will not bend, twist or short circuit.