7504B
Solder type center, UHF Male Twist-on, Delrin Insulation, Silver Pin, Nickel Plated Body. RG8X, RG59, RG62, etc...

7504B

PL259 twist-on, solder type center pin, UHF Male (PL259),
Delrin (E I DuPont ^{Reg tm}) Insulation, Silver Pin, Nickel Plated Body,
for; RG8X, RG59, RG62, RG210, more.

UHF Male Twist-on, with builtin reducer/adapter. Same as PL259 with
built-in reducer for RG59 and RG8X.