The Mega Pro 151HX 15-in-1 Hex Screwdriver is crafted with precision and functionality in mind, this versatile tool ensures you have the right bit at your fingertips whenever you need it.Equipped with a retractable bit cartridge, finding, changing, and storing bits has never been more convenient. The bits are securely held in the screwdriver shaft by a spring-loaded ball bearing, guaranteeing a reliable grip for seamless operation. The alloy steel shaft also doubles as a 1/4" Hex nut driver, providing added utility for various applications. Enhancing your control over every task, the EZ Guide Collar ensures optimal contact between the bit and the screw. This feature promotes greater precision, making your projects more manageable and yielding professional results.