Mil-Spec, Oversized, Standard, Beveled, Large Outside Diameter
Phenolic Resin, Brass, Alloy Steel, Stainless Steel, Titanium
20 mm, 2 3/16", 1 37/64", 15/16", 2 3/4"
10.5 mm, 0.375", 0.75", 0.875", 1.125"
M36, 1 1/2", 1 3/8", #12, M8
NL-19, Armor Coat, Plain, Black Oxide, Zinc Yellow
4.6 mm, 0.35 mm, 3.3 mm, 4.3 mm, 1/8"