Included is 1 each 5/8"-11 UNC Male Thread to 1/4" Round Shank Drill Adapter. This adapter allows the conversion of 5/8"-11 threaded rotary sander, grinder, and polisher backing plates to a 1/4" round shaft size, making them compatible with drills, drill presses, and die grinders. It offers adaptability by enabling the use of 2” to 6” hook and loop backing plates with 5/8"-11 thread to be used with 2" to 6" sanding, buffing, and polishing pads with drills, drill press, or die grinders. The universal 1/4" round shank adapter fits into the drill chuck or collet of electric or cordless drills, drill press, and die grinders. Made from high-quality machined steel, this Drill Adapter meets ANSI and EU standards.