Effective Protection: Our jack wheel chocks help 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, offering enhanced support and durability. Reliable Material: Made from high-quality rubber, these heavy-duty caster wheel chocks provide long-lasting protection for your jack caster. Designed for resilience and performance, this product offers extended service life and dependable wheel support. Product Size: Trailer wheel chock stabilizers measure approximately 6.6 x 5 x 1.38 inches. Built to withstand prolonged outdoor use, ensuring safety and stability. Compatible with 6-inch casters. With the included base and stabilizer, you can park your travel trailer securely in various locations. Extended Service Life: These heavy-duty wheel chocks help keep your jack wheel clear of sand, oil, mud, and dirt, contributing to longer equipment life. Features drainage holes to promote drying and reduce debris buildup, ideal for users who prioritize trailer wheel maintenance. Wide Application: Suitable for a variety of solid wheels on RV trailers, camper trailers, boat trailers, tent trailers, and campers. Offers broad compatibility and easy installation across different trailer types and wheel sizes. Color: As shown Material: Rubber Package Contents: 1 set x Trailer jack block Note: Light reflection and display settings may cause slight variations between the color in the image and the actual item. Measurement may vary by +/- 1-3 cm.