Okay, this scissor jack adapter is one of those tools you don't realize you need until you try it, and then you wonder how you ever lived without it. It lets you use your 1/2 inch drive impact wrench or ratchet with your vehicle's scissor jack, which makes raising and lowering your car so much faster and easier. No more cranking that little handle for what feels like forever - just zip it up or down in seconds. It also works with 13/16 inch lug wrenches or tire irons if that's what you have handy. The adapter is made from chrome vanadium steel with a black oxide treatment that resists rust, and it's built tough to handle the torque from impact tools. The slot size is about 8.8mm wide by 23.9mm deep, so it fits most standard scissor jacks with oval openings. I've used this for changing tires on my car and trailer, and it cuts the jacking time down dramatically. The package includes both the jack adapter and a socket adapter, so you're covered for different tools. It's small and lightweight enough to keep in your glove compartment or emergency kit without taking up much space. If you do any kind of automotive work, RV camping, or trailer towing, this little tool will save you so much time and effort. Seriously, once you've used power tools to operate your scissor jack, you'll never go back to manual cranking again.