Help Seal Joints Prevent Leakage And Provide Cushioning Under The Head Of The Bolt Or Nut. *Our Bonded Washers Are Ethylene Propylene Diene Terpolymer Which Is An Extremely Durable Synthetic Rubber. **Sizes Available: *Bonded Washer Epdm 6 Mx19mm *Bonded Washer Epdm 6 Mx26mm