Stair-Step Tube Rack Organizer holds three tube racks in successive heights for clear viewing of labels and easy retrieval ∙ Stair-Step Tube Rack fits virtually any manufacturer of 13mm-17mm tube rack∙ Tiered design makes tube labels easier to read∙ Holds three 13mm or 17mm tube racks∙ Made of clear PETG for visibility, ease of cleaning, and durability∙ Interior dimensions: 9.75""""L x 5""""W x 2..625""""D∙ Overall dimensions: 10.25""""W x 16.25""""D x 6""""H