Tired of wasting time moving vehicles with a jack and dolly Its time to GoJak Their clever model 6313 selfloading automotive dollies permit vehicles to be jacked up and go mobile quickly and easilywithout air oil or electricity Being the strongest in their lineup they are equipped with steel rollers wider axles and two heavyduty 5 in and two 4 in diameter doubleball raceway castersa combination that makes rolling heavier loads up to 6300 lbs much easier The 6313 models feature a 5 degree offset pedal for additional foottotire clearance plus additional frame clearance which can be very useful when pulling cars up on to flatbed trucks Move cars by yourself effortlessly with GoJak 6313 dolliesthe faster caster system Features. Steel rollers wider axles and two heavyduty 5 in diameter and two heavyduty 4 in diameter doubleball raceway casters. 5degree offset pedal for additional foottotire clearance. Under frame clearance is increased an additional 212 inches over the 5211 which is very useful when pulling cars up flatbed trucks. Purple powder coated steel