DIY installation with step-by-step instruction. Installation template helps make plan. This overhead storage rack fits all ceiling joist spacing ≤ 24", if joist spacing > 24", only fits the ceiling spacing of 48". Can NOT be mounted to metal wall. Suitable for wood studs/joists and concrete wall. Different - Integrated Grid Design - More stable and sturdy compared to others with separate frame and wire. Quality - Top quality screw selected and all hardwares have gone through strict tests. Heavy duty cold-rolled steel construction provides safely loading up to 600 lbs. Safe - Buy overhead racks with long ceiling brackets designed to be attached to 2 studs. Combined with 6 vertical posts, it is the optimal structure choice to ensure safety. Avoid Water Damage by Storing Your Items off the Garage Floor. Protect your items and use garage ceiling space to store seasonal and unused items. 22'' to 40'' ceiling dropdown provides up to 105 cu. Ft. of storage. Dimensions: 96 in. L x 48 in. W x 22-40 in. H. （Accessory hooks and items pictured on the racks are not included.）.