Ever wish you could use your Ryobi 18V batteries on your DeWalt 20V MAX XR cordless tools? Now you can! This clever little adapter is the missing link. It's super simple - just snap your Ryobi 18V battery onto one side and click your DeWalt tool onto the other. You'll hear that satisfying 'click' when it's locked in place. It's made from tough, high-quality ABS plastic (mold injected for strength) so it can handle the job site. The dual-color design makes it easy to see which way it goes. A couple of super important things to know: First, this adapter is ONLY for powering the tool. It won't charge your Ryobi batteries - you'll still need your Ryobi charger for that. Second, it's specifically for DeWalt 20V MAX XR type tools. It won't fit Craftsman, Porter Cable, Black & Decker, or similar models. Pro tip: Make sure your Ryobi battery is fully charged before you start. A lot of tools have built-in low-voltage protection, and a weak battery might not work right. It comes as the adapter only (battery and tool NOT included). Seriously, if you've got both brands of tools sitting around, this is a game-changer for saving money on extra batteries.