LFA Industries 322-1/2 0-1/2-0-.13mm Capacity 1/2-20 Threaded Mount Keyless All Steel Ball Bearing with Super Holding Drill Chuck Keyless All Steel Drill Chuck LFA Industries 322-1/2Threaded Mount All Steel Ball Bearing 0-1/2-Inch-0-.13 mm Capacity, 1/2-20 Threaded Mount Made in France over 85 Years