(100) Neoprene Washers | 3/4 X 5/16 X 1/16 Inch | Rubber Washers | 5/16 ID (100) Neoprene Washers | Rubber Washers | 100 Count Bag 3/4 Inch | Outside Diameter 5/16 Inch | Inside Diameter 1/16 Inch Thickness 60 Duro +/-5 | Use for spacers, vibration supression, mounting, metals, counter tops