CRL has combined the safety of a vacuum cup with a rolling dolly to make a compact and portable tool for transporting glass and stone. The rolling wheels have sealed bearings and are 8" (203 mm) in diameter. The vacuum cups are operated by a flip-lever and are 4-1/2" (114 mm) in diameter. Weight capacity per Roller Dolly is 300 lbs. (136 kg) each, 600 lbs. (272 kg) per pair, and each unit can accommodate a material thickness of up to 1-1/2" (38 mm).