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, offering enhanced support and durability. Reliable Material: Our rubber caster wheel chocks are made of high-quality rubber, extra heavy-duty, providing long-lasting protection for your jack caster. We use superior materials to ensure a long service life, making this an ideal choice for long-term wheel protection. Product Size: Our trailer wheel chock stabilizers measure approximately 6.6 x 5 x 1.38 inches. Designed to withstand prolonged outdoor use, they help ensure safety and stability. The trailer tongue jack wheel mount is compatible with 6-inch casters. With the base and wheel chock stabilizer included, you can park your travel trailer securely in various locations. Extended Service Life: Use our heavy-duty wheel chock to help keep your jack wheel away from sand, oil, mud, and dirt, extending its service life. This wheel chock features drainage holes to promote drying and reduce debris buildup, ideal for those who prioritize trailer wheel maintenance. Wide Application: Our trailer jack wheel chock accommodates a variety of solid wheels on RV trailers, camper trailers, boat trailers, tent trailers, and campers. Enjoy 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 different displays may cause slight variations in the color of the item in the picture compared to the actual product. Measurement may vary by +/- 1-3 cm.