This Arctic Hayes O Ring Selection Box contains 18 different universal imperial O-Ring sizes. These nitrile rings resist heat, most petroleum and silicone fluids, hydraulic and non-aromatic fuels and solvents. Supplied in a PVC case and contains the following:

20 of each size: 1/8 x 1/4in, 5/32 x 9/32in & 3/16 x 5/16in.

15 of each size: 7/32 x 11/32in, 1/4 x 3/8in, 5/16 x 7/16in.

10 of each size: 3/32 x 15/64in, 3/8 x 1/2in, 5/8 x 3/4in, 3/8 x 9/16in, 7/16 x 5/8in, 1/2 x 11/16, 9/16 x 3/4in, 5/8 x 13/16in, 11/16 x 7/8in, 3/4 x 15/16in, 3/4 x 1in & 13/16 x 11/16in.