Gloaso 12V- 48V DC 300 Amp Bus Bar Box Heavy-Duty Module 4X 5/16” Post Terminal Power Distribution Block, 300A Negative Bus Bar with Cover, Black Black- 300A- 4 x 5/16" ( M8) Studs update_march2023 and it can be used

and it can be used directly by screwing into the threaded rod

Electric relay for controlling electric signals in low current applications

it can be powered via various ways

Threaded Inserts Repair Kit 304 Stainless Steel Helicoil Type Wire Insert Installation Tool Set (M6x1

Gloaso 12V- 48V DC 300 Amp Bus Bar Box Heavy-Duty Module 4X 5/16” Post Terminal Power Distribution Block, 300A Negative Bus Bar with Cover, Black Black- 300A- 4 x 5/16" ( M8) Studs update_march2023 and it can be usedGloaso 12V 48V DC 300 Amp Bus Bar Box Heavy Duty Module 4X 5 16 Post Terminal Power Distribution Block, 300A Negative Bus Bar with Cover, Black Product Features Solid and Heavy Duty 4 studs ( 5 16"( M8)) Busbars,Removable windows for unobstructed wiring. Waterproof &Dustproof Material: Sturdy Nylon, Glass Fiber reinforced,Bus Material: Brass, Nickel plated Max Amperage: 300 Amps at 12V DC per connection. Max Voltage: 48V DC. Universal for RV, Solar,