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+1 (217) 579-8045Specifications1/4" Special Jacobs 7BA Drill Chuck.3/8-24 threads. Key is model T-77887BASPAB. High quality machined gear. Key is model T-9888-SPB. Chuck and key are model T-77887BASPC. This chuck can be used on forward and reversible drills. Capacity 0-1/4" (0 to 6.5mm).