Blue Epoxy Coated Wire Test Tube Rack, 72 Holes, Outer Diameter permitted of tubes 15-16mm or less, 6 X 12 Format. Rack measures 9.5" x 5" x 2.5" Holds a total of 72 test tubes. Coated steel wire racks are chemical and corrosion resistant. Coating provides a protective and smooth coat that is impervious to weak acids , bases and salts. With stands temperatures up to 121 degrees C ( 249.8 degrees F)