Sold as one unit. (1 unit = each.) Expanding design allows the Drainkey to internally grip in a 360 degree pattern. Expands with a crescent wrench to unlock or install: bathtub drains 1-1/4" or 1-1/2" closet spuds, duplex strainers, Jr. duo strainers, Jr. basket strainers, tray plug drains and more . Manufacturer number: 04500. SKU #: 4294492. Country of origin: China. Distributed by Superior Tool Company.