1Compatible Lifting Jacks: Suitable for full cast jacks, cast/steel jacks, replacement for X?Treme jacks, Utv jacks, replacement for Patriot jacks, equipment/agricultural jacks (j ?550). 2 Material: The jack alleviate pad is made of hard nylon synthetic material, which is better than wooden products and is not easy to break. 3Easy to Use: Simply drill a hole in the center of the superior jack off?road base to connect to your jack rod to use, very simple and convenient. 4Serrated Side: The off road jack plate is carefully designed with a serrated surface to help scrape hard dirt or gravel, creating a clean, level surface for the base. 5Compact Size: The heavy duty jack alleviate base is professionally designed with exquisite look and compact size, taking up less space, and is easy to store and carry.