Round Spacer, Spacer Type Round, For Screw Size 1/4 in, Overall Length 5/8 in, Inside Diameter 0.252 in, Outside Diameter 1/2 in, Retaining Rib Diameter Not Applicable, Material Aluminum, Material Grade/Class 2011-T3, Finish Black Anodized, System of Measurement Inch/Metric, Hex Width Not Applicable, Color Silver, Package Quantity 25