Likewise, the 3/8" for 12 gauge jacketed cable. If done like the photo, you also need their smallest, the 1/8" for the separate leads, cable pants (I get mine from KnuKoncepts via eBay), and a couple different sizes of heat shrink tubing.
For the banana plugs, I use Blue Jeans Cable Locking Banana plugs.
KEF R500, R200C, R100, R50, SVS SB2000 sub, NAD T758v3 AVR, Pro-Ject RPM1 TT w/ Ortofon 2M Red, Bluesound Vault2, LG UP875 4K BlueRay, Samsung UN55JU6500F 4K LED TV, KEF M500 headphones, Sony CDP-CE500 CD changer. Desktop: NAD M10, KEF LS50, KEF Kube 10b. Guest room: Hafler 200 L-R, KEF reference Model 100 center, KEF iQ10 surrounds, M&K V-90 sub.