The Wera 817 R Bit Holding Screwdriver is suitable for 1/4″ DIN ISO 1173-C 6.3 and E 6.3 hexagon insert bits and Wera Series 1 and 4. It features a Rapidaptor technology for rapid change of bits or blades. The design includes a retractable bayonet blade, a hexagonal anti-roll feature to prevent rolling away, and a magnetic tip. This screwdriver is designed with the professional in mind, utilizing Wera's experience in narrow tolerance manufacturing and careful material selection for maximum safety at work.