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Built for maximum durability and a long life on the job, the IRWIN Tools 1/4" Hex Shank Magnetic Bit Holders are tooled for a precise fit to prevent stripping and increase the life of your bits. Designed for insert bits only, these bit holders can be used with socket wrenches or socket adapters. With a C-ring design, they feature an internal clip that fit to hold bits securely in place. Suitable for most general-purpose fastener-driving needs, they utilize rare earth magnets that are 4X more powerful than standard magnets.