The Bosch SG450P2 2 pc. 5-3/4 In. Phillip sP2 Screwdriver Bit Optimized for Auto-Feed System allows for precise driving of rows of screws at top speed, while enabling comfortable work. Made from the highest quality tool steel, the bits are fully hardened. Their jobsite-proven tempering process gives these bits increased durability. This helps to ensure long life under constant demanding use. They are engineered with precision-formed tips for proper fit.