Gender Mounting information be found on this page -
Gender Mounting Instructions
You need to know what Gender Changers you will be installing so you know what mounting hardware you'll need.
Female to Females come with stock Jack Screws & stock Hex Nuts.
Male to Males & Female to Males only come with stock Jack Screws (No Hex Nuts).
For Female to Female: You'll need the Jack Screws below and you can use the stock hex nut.
For Male to Male - Male to Female - Female to Male: You'll need the Jack Screws and Hex Nuts below.
Remember - Each Gender Changer requires 2 Jack Screws & 2 Hex Nuts. It is very easy to over-tighten and strip the threads so you may want a few extras!
4-40 Jack Screws Specially Designed Short Head Full Threading