Tosnail Z-style Heavy Duty Adjustable Piano Keyboard Stand Holder - Suitable for 54, 61 Keyboard or Electrical Piano Suitable for 54, 61 Keyboard or Electrical Piano. Diameter of the tube: 20mm. Adjustable height from 20" to 34". Z-style shape allows for playing from either side. Assembly required, and it's easy. Pack including Z-style keyboard stand & 12 screws. Non-slip rubber end caps add extra stability.