Whidden Gunworks has three different sizes of decapping pins, depending on the age of the die and the cartridge.
The most current pin is the Standard Pin, 3/64″ diameter (.047″) and straight, and is used on all cartridges (except .375/.408 CT) and all primer and flash hole sizes.
Previously, we used the Large Pin, a 1/16″ diameter striaght pin (.0625″).
The third version has a step and is .0625″ on one end and .052″ on the other and is referred to as the Stepped Pin. The stepped pin is needed for use with .375/.408 CT.