Blue Epoxy Coated Wire Test Tube Rack, 80 Holes, Outer Diameter permitted of tubes 18-20mm or less,8 x 10 Format. Rack measures 9.5" x 8" x 3" Holds a total of 80 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)