This 140 pieces rotary tool kit is ideal for various applications and crafting jobs. The high-quality motor provides strong rotating power and multiple cooling holes can effectively dissipate the heat of the motor to extend its service life. The 6-level variable speed of 8 000- 32 000 RPM allows you to set and adjust the speed flexibly according to the work contents and the type of materials used. A total of 140 attachments and accessories cover a variety of applications such as grinding cutting drilling etc. The rotary tool with ergonomic and compact design is easy to operate and comfortable to grip. This high-performance electric rotary tool kit is definitely a powerful machine! --High-quality motor provides strong and steady power --With variable speed of 8 000-32 000 rpm for precision control --Non-slip rubber handle provides comfortable grip and easy control --With 3 different sizes of collets for different accessories --A storage box keeps all the accessories well organized --Can meet various needs such as grinding drilling and polishing --Easy to carry with lightweight and compact design