Lock Block and Chock LB-10 RV and Trailer Interlocking Leveling Block, (Pack of 10) High-density molded polypropylene, effective on hard or soft ground, Individual block height is 1-3/8 inches. It's weight capacity is 30,000 pounds. It is 8.25 inches long, 8.25 inches wide x 4.25 inches heigh