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APPLICATION. The Stahlwille Bit Holder No. 442 is specifically designed for 1/4" inside hexagon sockets. It features an internal hex drive with a collar-thrust spring for secure gripping EASY TO USE. The bits are easy to insert, lock securely in position, and can be removed easily, even hex bits with a wide groove HIGH-PERFORMANCE QUALITY. Stahlwille Bit Holders are made of HPQ high-performance steel, which makes them extremely resilient but thin-walled and gentle on fastener heads