If you are a drone hobbyist then this kit of hex-angular screwdrivers is a great set to have. It comes with the four most commonly used sizes on your drones. The 1.5mm and 2.0mm are the most common size hex-angular screws on the DJI Phantom series drones, the DJI Inspire series, the Yuneec Q500 series, and the Yuneec Typhoon H. Having the right tools for your drone is a must.