It should be fairly universal for the 2nd hole behind grip screw hole. Ive seen it work on regular and 80% lowers of various brands.
Aero Precision does not provide the diameter of their Nylon Tipped Tension Set Screw, it is designed to be inserted into the grip tang of Aero's Gen 2 Lower Receiver and tightening against the upper receiver until there is no wobble between the 2 parts. I'd recommend reaching out to Aero Precision directly for more information.