Roughneck Heavy-duty Gorilla Grippers are the safer, easier way to carry sheet materials and heavy bags. Enabling large and bulky items to be moved single handedly. Manufactured from heavy-duty aluminium with a comfort grip, the ingenious design uses two parallel pads to grip materials securely using their own weight as a locking mechanism. Suitable for all types of boards or sheet metal and also ideal for gripping the tops of large bags to carry sand, gravel, animal feed etc.Specification:Max. Load: 90 (200lbs).This Roughneck ROU32610 iwill clamp easily to boards or doors from 10mm up to 28mm for ease of movement around rooms or work site.