The Wera 05051000001 818/4/1 Bit-Holding Screwdriver is a quality Wera screwdriver with bits stored inside the handle. Features Rapidaptor for rapid-in, rapid-out, rapid-spin, chuck-all and single-hand technology. Features a Kraftform holder with Rapidaptor quick-release chuck, along with tough viscous bits for universal use. The torsion design of the bits against premature wear, ensuring optimal tool life. Includes retractable bayone blade.