The Turnigy Adjustable 12 in 1 Multi Tool driver set includes metric hex sizes 1.5, 2.0, 2.5, 3.0mm and SAE sizes 0.50",1/16", 3/32", 5/64". It also includes phillips and flat head screw driver bits. All drivers are convenietly stored inside the handle when not in use. With the friction fit action, you can actually choose how much of the driver bit is expose. From short for those tight spots, to long, when you need to reach deep. The handle is made of light weight aluminum, with steel driver shanks. Due to how compact it is, the Turnigy Adjustable 12 in 1 Multi-Tool driver is great for keeping in your field box or transmitter case.