BULLDOG 10,000 lbs. (4,535 kg) support capacity square jacks "fills the gap" between 8,000 lbs. (3,628 kg) and 12,000 lbs. (5,443 kg). If the existing 8,000 lbs. support capacity square jacks are too small or the 12,000 lbs. support capacity square jacks are too big, look no further - your application and pricing requirements have been met! This is the highest quality and best performing jack available in the marketplace today, a total balance between capacity, speed, and effort.