These are special-purpose, fixed wrenches designed for servicing packing glands, adjustable collars, rings, locknuts, etc.
Center distance of pins (A) - 3-1/2
Pin Diameter (B) - 5/16"
Pin Length (C) - 5/16
Span of jaws in clear (D) - 3
Length from Center of Pins (E): 9 3/4"
Thickness (F) - 1/4
Made in the U.S.A.