Effective Protection: Our jack wheel chocks prevent wheels from rolling or sinking on soft ground and reduce sideways movement when the RV is stationary by distributing weight evenly. A reliable solution for trailer tongue stability, providing added safety and support. Reliable Material: Made of durable rubber, these heavy-duty caster wheel chocks offer long-lasting protection for your jack caster. High-quality construction ensures extended service life, making them ideal for long-term wheel protection. Product Size: Trailer wheel chock stabilizers measure approximately 6.6 x 5 x 1.38 inches. Designed to withstand outdoor conditions, they ensure safety and durability. Compatible with 6-inch casters. The base and stabilizer allow secure parking in various locations. Extended Service Life: Heavy-duty wheel chock helps keep your jack wheel clear of sand, oil, mud, and dirt, prolonging its lifespan. Features drainage holes for improved maintenance and performance in wet conditions. Wide Application: Suitable for various solid wheels on RV trailers, camper trailers, boat trailers, tent trailers, and campers. Offers broad compatibility and easy installation across different wheel types and sizes. Color: As shown Material: Rubber Package Contents: 1 set x Trailer Jack Block Note: Light reflection and display settings may cause slight color variations between the image and actual item. Measurement may vary by +/- 1-3 cm.