Semi Automatic Screwdriver:Press the handle, the spiral knife bar will automatically rotate to achieve the effect of tightening or loosening the screw, it's faster than other screwdrivers. These spiral-ratchet models are much easier on your wrists and give your wrist a rest. Adjusting Switch:There are 3 modes adjustable: loosen, tighten and fix, easy to use. Suitable for various occasions. Comfortable Handle:Comfortable to grip, convenient and practical. High Hardness Material:Made of chromium vanadium alloy steel, strong and durable. It is small and portable, can be put in your tool box. Simple Assembly and Disassembly:Simple self-locking type, pull back the lock housing to open the lock and insert the batch head, easy to lock the batch head. The self-locking shell can be fixed when rotating, suitable for handheld using. Our Push Pull Ratchet Screwdriver is a semi automatic screwdriver which is easy to use and faster than other manual screwdriver when working. Fantastic screwdriver, very easy to use. It is small, fits in my impact driver tool box and is way faster than a regular screwdriver when I don't have my impact driver in where I am working. The tool seems solid and well built. This product adopts ratchet wheel to connect with spiral knife bar. When the handle is pressed down, the spiral knife bar will automatically rotate. Each time the handle is pressed down, the batch head rotates 1.2 turns. According to the adjustment of the switch device to achieve the effect of tightening or loosening the screw, suitable for various occasions! It can easily solves the problems of narrow space, deep screw position, and unreachable screw. One-hand press operation, it can be used in the position while other screwdriver can't. Warm Tips:the top of the batch head is half moon shaped card head, not hexagonal head! When installing the batch head, pull the sleeve up and insert the batch head, and then release it. The batch head will be stuck tightly. If the screw shrinks and d