A-Frame Jack 5K Capacity Lifts 12-1/2"Bulldog round jacks are recognized as the industry standard by leading agricultural, commercial, horse, livestock, and other trailer manufacturers. For more than three quarters of a century, Bulldog jacks have been demonstrated to be the most reliable, field proven jacks on the market. Features: Smooth, comfortable, ergonomic design Dependable vertical and side load capacity Proven reliability for long term use at rated loads Precision fitted parts