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The Proto J4990-8M is an 8mm hex bit socket with a 3/8-inch drive, made by Proto. Designed for durability, it features a heat-treated alloy construction that resists wear and minimizes distortion.
This socket combines a 3/8-inch drive with precise 8mm sizing, perfect for various mechanical tasks. Its hex opening design ensures the bit stays in place, distributing the torque load effectively.
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