Has a maximum of 90lbs. Easily changes to advance anywhere in the Palram greenhouse of yours. Potential to mount more racks side area by side area. Corrosion resistant aluminum. Warranty: one Year Limited. 24.5 within. L x 16.5 in W x 1 in H (5.5 lbs). All brand new 24.5 in. x 16.5 in. tough shelf set up provides a lot more workspace and keeps a maximum of ninety lbs of plant life, watering other, soils, and cans greenhouse necessities. Easily changes to advance anywhere in the hobby greenhouse of yours. Mount a number of racks side area by side area to develop additional workspace.