Use in plumbing, hydraulics, air, and gas connections. Ideal for shop, garage, and workplace. Assortments come in a convenient resealable plastic case. Stores great in your shop or toolbox407 Piece SAE O-ring assortment kit contains the following: 10 each (inner dia. x outer dia.): 3/4" x 1", 13/16" x 1-1/16", 7/8" x 1-1/8", 15/16" x 1-3/16" , 1" x 1-1/4", 1-1/16" x 1-5/16", 1-1/8" x 1-3/8", 1-3/16" x 1-7/16", 1-1/4" x 1-1/2", 1-5/16" x 1-9/16", 1-3/8" x 1-5/8", 1-7/16" x 1-11/16", 1-1/2" x 1-3/4", 1-5/8" x 1-7/8", 1-3/4" x 2", 1-7/8"  x 2-1/8",  and 2" x 2-1/4". 20 each (inner dia. x outer dia.): 1/8"  x 1/4", 3/16" x 5/16", 1/4" x 3/8", 5/16" x 7/16 ", 3/8" x 1/2",  and 1/2" x 5/8". 13 each (inner dia. x outer dia.): 3/8" x 9/16", 7/16" x 5/8", 1/2" x 11/16", 9/16" x 3/4", 5/8"  x 13/16", 11/16" x 7/8", 3/4" x 15/16", 13/16" x 1", and 7/8"  x 1-1/16.