This CRL Four Wheel Glass Dolly is designed to provide additional stability while transporting lites of glass within the shop environment or from your truck to the delivery site. The Four Wheel Dolly has 8" (203 mm) diameter solid rubber wheels and a vulcanized rubber frame channel, which protects the glass against chipping or damage while in the process of being moved. The inside width of the channel measures 3-1/8" (79.3 mm); overall length of the channel is 20" (508 mm).