When I picked up this tool and pressed the button, I was sold. A hidden internal storage chamber slowly emerges exposing 10 interchangeable micro bits. Find the additional 11th bit in the driver end. The driver features a ratcheting action and a lock setting. At only 6" in length and 1 1/4" diameter, the tough plastic housing is designed with a soft rubber grip for comfort. The bits are made from chrome molybdenum steel for durability. Bit selection includes: 3-Phillips #00, 0 and 1, 3-slotted 2.0, 2.5 and 3.0mm and 5-TORX® T6, T7, T8, T9 and T10. This makes a great stocking stuffer gift for your toolbox, desk and kitchen drawer. When you get yours you won't be able to stop watching the chamber open. It is that cool!