... -3000kg per level +Assembled freely and adjustable Heavy duty rack display shelf The heavy type of pallet rack is the most cost effective storage system ... storage needs. 5. Main Parts Specs:1) Uprights:75*66mm, 90 *66mm, 100 *66mm, 120 *66mm, etc. 2) Box beams: 80 ... *50mm, 90*50mm, 100*50mm, 110*50mm, 120*50mm, 130*50mm, 140 ...