Female Banana Plug / Binding Post to 20mm T-Slot Holder

This is a part for attaching female banana jacks / binding posts that you can buy online (I bought mine on Banggood) to a 20mm rail. I used this on my Kossel 3d printer to use my printer power supply for charging LiPo batteries.

Update (8 April, 2016): Changed banana-to-banana spacing to 3/4in to match standard spacing. Thanks ArizonaClark.