Knobs can be used as male and female version depending on your needs.

This set included:

• M4
• M5
• M6
• M8
• M10
• M12

Print Setting:

• Layer height 0.24 or larger
• Print on the given orientation
• no supports needed

Other version of knobs

https://www.printables.com/model/1276920-wing-knobs-set

Noted 

• if you want to make your own size feel free to download the freecad file or just let me know. 
• If you enjoy this model please consider to buy me some filament ( Paypal )