Sitting 1/4" LOWER than your every day door dolly and 1" LOWER than a Standard 4" dolly, the yel-Low Safety Dolly is the KING of limbo! With our special Corner Bumpers/Connectors (sold in sets of 4) not only do they protect against gouging walls in tight space areas but also functions to allow multiple dollies to be connected to form a bigger base. Here we combined two to form what we call the Dual Dolly! As you can see by connecting the two of our best selling yel-Low safety dollies, the base can be multiplied in length or width giving the user the ability to move practically ANYTHING (weight limits allowing)! Breaking limits is what we do best and the Dual Dolly does just that.