Mil-Spec, Standard, Beveled, Oversized, Large Outside Diameter
Nylon, Phenolic Resin, Brass, Alloy Steel, Titanium
20 mm, 1 9/32", 2 3/16", 1 37/64", 15/16"
1.375", 1.281", 0.75", 0.875", 1.125"
1 3/8", M18, 7/8", 1/2", #4
NL-19, Black Oxide, Zinc Yellow, Armor Coat, Plain
13/64", 4.6 mm, 0.35 mm, 1.8 mm, 2.7 mm