LFA Industries 520-1/2 0-3/8-Inch -.5-10 mm Capacity, 1/2-20 Threaded Mount Keyless All Steel Ball Bearing with Super Holding Drill Chuck Keyless All Steel Drill Chuck LFA Industries 520-1/2 Threaded Mount All Steel Ball Bearing 0-3/8-Inch-.5-10 mm Capacity, 1/2-20 Threaded Mount Made in France over 85 Years