"This single Black Widow Hydraulic Wheel Dolly fits around a vehicle tire and compacts two rollers inward when operating the hydraulic foot pedal to push a vehicle wheel 4.25"" upward, allowing it to be maneuvered around the shop, showroom, garage, or along most level surfaces. Each vehicle positioning jack includes an integrated safety locking pin to keep rollers in place while moving a vehicle around, and a safety hook to suppress the hydraulic foot pedal. Black widow wheel skates each feature two 9"" L by 2.75"" D wheel rollers with a minimum distance of 12"" between rollers when compacted, and 21.375"" maximum distance when extended. Maximum 1,500-pound capacity per wheel dolly. The BW-CJD series wheel dolly is designed for use with a 9"" maximum tire width, for 13's, 14's, 15's and is known to work with 55R16, 60R16, 65R16, 65R17 (low profile), 70R16 and 75R15 wheel sizes. Made with heavy-duty reinforced steel construction built to last with a black paint finish."