5/16" lock washer locking split BLACK OXIDE .322" ID x 583" OD x .078" thick
You will get 4 brand new 5/16" split washers as pictured. These are 18/8 stainless steel that are Black Oxide coated, correct for Antique Motorcycle and Auto restoration.
For a 5/16" screw, .322" ID x 583" OD x .078" thick