Included is 1 each 5/8"-11 UNC Male Thread to 1/4" Hex Shank Drill Adapter. This adapter allows the conversion of 5/8"-11 threaded rotary sander, grinder, polisher backing plates and core drill bits to a 1/4" hexagon shaft size, making them compatible with power/cordless drills and drill press. 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 or drill press. The 1/4" hex shank adapter fits into the drill chuck of electric or cordless drills and drill press. Made from high-quality machined, hardened and blackened steel, this Drill Adapter meets ANSI and EU standards and comes with a 100% Product Guarantee. If you are not satisfied with the product, simply return your purchase within 30 days for a replacement or refund. Pro-Graad is an American company with US-based customer support.