This FTZ Industries battery lug is industry standard black color code for 1/0 ga wire and is embossed with the letters E-A for the die settings.
This E-A embossing tells you the correct dies to use when crimping with industry standardized crimpers. The industry standard crimp tool for battery lugs is generally the AMP Rota-Crimp tool. While there is no standard acceptable range that I can find for lug crimping tolerances, the Amp is the tool of choice for many professionals, industrial plants, factories aerospace, trucking industry etc..
FTZ uses the *same rotating die standard with the same letter codes as the AMP tool. I have crimped Ancor, FTZ, Quick Cable, Molex, T&B, AMP lugs & more with the FTZ tool. It works tremendously well on all those lugs with minor manufacturing variations resulting in slightly differing pull out numbers. Apparently Ancor/Marinco is now sourcing whatever they can get for the least amount of money and the tolerances are often out of whack to the rest of the industry. Their "heavy duty" lugs are also not color coded or embossed with die settings. Sometimes their lugs are fine others they are quite different from the rest in terms of heft.
*About as close as it gets I suppose, without patent infringement.
As you can see in the photo there are two positions separated by black stripes where your crimp tool is to make two separate crimps. In the picture I am in the position to make the first crimp.