Plastic rack for 10, 15, or 50 ml tubes. Fit test tubes or centrifuge tubes. 20 holes for 50 ml tubes (hole diameter 1 1/8", 28 mm). 30 holes for 10/15 ml tubes (hole diameter 5/8", 15 mm). Easy assemble. Size: 8" x 6.5" x 2.5". Weight: 6 oz. Color maybe different.