Product Description Specifications: Oil-Resistant Rubber Construction, Nine Common Sizes Each of O-Rings and Grommets, Ideal for Mechanical and Electrical Applications, O-Rings: 20-pc. 1/8" x 1/4", 15-pc. 3/16" x 5/16", 10-pc. 1/4" x 3/8", 10-pc. 5/16" x 7/16", 10-pc. 3/8" x 9/16", 10-pc. 1/2" x 11/16", 10-pc. 5/8" x 13/16", 10-pc. 11/16" x 7/8", 10-pc. 3/4" x 15/16", Rubber Grommets: 20-pc. EWG-1 - 1/8" x 9/32", 20-pc. EWG-6 - 3/16" x 5/16", 15-pc. EWG-13 - 1/4" x 1/2", 10-pc. EWG-26 - 3/8" x 1/2", 10-pc. EWG-27 - 3/8" x 9/16", 8-pc. EWG-31 - 3/8" x 3/4", 3-pc. EWG-36 - 1/2" x 21/32", 2-pc. EWG-44 - 5/8" x 1", 2-pc. EWG-45 - 3/4" x 15/16"