The Panel Express Self-Adjusting All-Terrain Panel Cart breezes over obstacles both inside and out. Able to carry up to 18 half inch sheets! How does it work? Self-adjusting brace mechanism automatically adjusts to hold up to three inches of material. Simply set your substrate down onto the dolly and the rubber lined clamp automatically clamps down on the piece. Need to carry more sheets? Lock the brace open load up to 3.5 inches of substrates in the clamp and stack your additional sheet goods on the optional shelf. Includes locking casters for easy loading and a convenient handle for moving the glass dolly when empty. 700lb capacity! Great as a drywall dolly, glass dolly, granite cart, door dolly and more. Able to carry fully framed windows!