LFA Industries 522-1/2 1/16-1/2-1.5-13 mm Capacity 1/2-20 Threaded Mount Keyless All Steel Ball Bearing with Super Holding Drill Chuck Keyless All Steel Drill Chuck LFA Industries 522-1/2 Threaded Mount All Steel Ball Bearing 1/16-1/2-Inch-1.5-13 mm Capacity, 1/2-20 Threaded Mount Made in France over 85 Years