The “H” dolly is the most popular dolly for all-purpose moving. It is constructed of 4/4 kiln dried oak with rounded edges and has features including 3/4″ fastening bolts. The standard “H” dolly comes with either black or gray heavy-duty conveyor rubber top surface. These also come standard with 3 1/2″ gray non-marking casters 5/16″ bolts and other casters are available.