This is DB61374 Random Orbit Head Kit. 5/8"-11 Female thread convert your standard rotary tool into a random orbital polisher. Mount to tool motors up to 3,200 RPM. No more swirls ! Kit includes: Random Orbital Polishing head. 7" diameter hook-face backing pad. Diameter natural sheepskin polishing pad, 3 wrenches sz: (26mm, 21mm, 19mm)