Rubber Multi-purpose Rubber Washers, Pack of 4, 1 1/2" OD x 3/4" ID x 5/16" Thick. High quality rubber of Proprietary formulation for durability and performance. 50+ years of manufacturing expertise. "#1 Anti-vibration Products" TM. Use for anti-vibration applications, as a spacer, grommet, cushion, etc. 100% Made in the USA!