What size T-slot nutsbolts do I want to get for the 20x20 Aluminum

Vslot Nut Bar v slot nut The nut can be easily rolled into the T-slot, and because it has a ball with a spring inside of the nut, it is fixated into place The Roll-in T-slot nut will vivo 138 slot This is a T Nut Holder for OpenBuilds V Slot System Useful when you want to keep t nuts in place, for example when you're mounting

vwin slot The M3M4M5 Tee Nuts are designed and custom made with angled corners to allow for a smooth transition when sliding into V-Slot Linear Rail