'Protective Case, For Use With (3) 58L or (3) 103L Calibration Gas Cylinders, Color Black, Construction HDPE Blow Molded Plastic, Exterior Depth 5.5 In., Exterior Length 20 In., Exterior Width 15 In., Inside Depth 4.5 In., Inside Length 18.5 In., Inside Width 13.75 In., Features Padded, Includes Foam Insert'