Sophistication and innovation meets the AutoLock designed for firmly holding bits in place with zero fuss. This one-handed bit driver is easy to use: the more you pull, the tighter it locks! Not only is the Insert-Bit Driver Holder magnetic and impact rated, but also magnetic and grips all types of insert bits--even smooth! Never pull away and leave a bit behind again. The AutoLock is desgned with purpose and precision to optimize your workflow.