This is a brand new set of five hex nut CEI. Each nut is made with one chamfered or beveled side and one flat washer face side. Please see picture for reference. Zinc plated finish.

Part #: S1-51, 21-0151, 00-0004, 01-4734, 02-0049, NM28681, 57-0224, 70-8133, 24-6040, 70-8087, 24-5160

Diameter: 5/16″
Thread: 26 TPI
Wrench Size: 1/4″ Whitworth
Thickness: 0.26″