First let me say that I'm a person who doesn't write a lot of reviews. But if so, then for a worthy and good product. I am a model builder, almost 50 years old. I'm always looking for new tools to help me build my model. I need easy-to-use and well-made tools that work as expected or exceed my expectations. This tool, the BYWOKY 3.7V Cordless Rotary Tool, definitely falls into the latter category. I risked it based on other reviews and was more than pleasantly surprised. Feels good in the hand, not bulky at all. Easily interchangeable bits, with built-in LED (nice touch) and easy to use with one hand. Variable speed from 3000 to 15000 rpm. It charges via USB and lasts long enough for my modeling session. I forgot to mention that it comes with 6 different sized collets, a set of whetstones, felt wheels, a cut-off wheel, 3 drill bits, diamond bits for engraving, carving and a bunch of sanding drums/belts. I also came loaded and ready to go. I've included a photo of the tool's ability to drill small holes. That's one of the main reasons I bought it, it just gets hard to hold the pin vise for long. This speeds up the hole and doesn't damage the plastic/resin I'm working with. Finally to all the model makers/crafters reading this review. Take my advice, this tool is worth your purchase. I am very happy that I bought it and will happily repeat it. I wish the company every success, they have created a wonderful tool.