MIS Tubular Retractor Set, (1) each 18mm Blue, 22mm Red, 26mm Violet Diameter Tubes in 50mm, 60mm, 70mm, 80mm, 90mm Lengths, (1) each Dilators in #1; 8mm Silver, #2, 13mm Green; #3, 18mm Blue; #4, 22mm Red; #5, 26mm Violet, Set Includes (1) Rigid Arm, Single Medium 400mm Length Arm, L-Column w/Square QC, (1) Table Clamp for Rigid Arm, Rotatable, (1) Rack Clamp, Square QC Fitting for Rigid Arm, Includes Universal Two Level Large Case, Lid Insert for 18mm, 22mm 26mm Tubes.