Adapters Proudly Made in the USA. Adapters are made of glass reinforced nylon 6 (PA6-GF30) which is the same material the drills are made out of. Adapters have 6 countersunk bolt/screw holes for mounting on walls, vehicles, etc , bolts/screws not included. Adapter has 2 6.3 mm brass male spade connectors over molded into the adapter that you plug your wires into. Terminals are 20 gauge yellow brass which is 70 percent copper 30 percent zinc for high power applications. Adapters have pluses and minuses on both sides of them indicating the positive and negative terminals. Adapter is based on my best selling 3d printed model but this is 5x stronger, and can be used outdoors. DISCLAIMER THESE UNITS DON'T HAVE ANY PROTECTION CIRCUITS IN THEM, USE AT YOUR OWN RISK. The following bullet points are directions on how to use this injection molded Milwaukee M18 battery Adapter. The first step is to mount the adapter where you want it, the holes are for M4, #8, or other flat head screws. Run your preferred wire (silicone, pvc, pe, nylon etc .) and preferred gauge (10, 12, 14, 16 etc .) to the adapter. Solder wires onto brass terminals or crimp female 6.3 mm spades onto your wires, and plug them into the adapter. You can run your wires horizontally or vertically out of the adapter, vertically stays inside the adapter for a low profile. Additional helpful Information You can connect most batteries in parallel and/or series if the batteries are exactly the same. If you don't want to over discharge your battery use a digital low voltage protector disconnect If you want a higher voltage like 24, 36, 48, or 60 volts use a dc to dc step up boost converter If you want a lower voltage like 5 or 12 volts use a dc to dc buck converter