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 of high-quality rubber, these heavy-duty caster wheel chocks provide long-lasting protection for your jack caster. Designed with superior materials to ensure extended service life, making them an ideal choice for ongoing wheel protection. Product Size: Trailer wheel chock stabilizers measure approximately 6.6 x 5 x 1.38 inches. Built to withstand prolonged outdoor use while maintaining structural integrity and safety. Compatible with 6-inch casters. With the included base and stabilizer, this kit allows for secure parking in various locations. Extended Service Life: These heavy-duty wheel chocks help keep your jack wheel elevated and protected from sand, oil, mud, and dirt, contributing to longer equipment life. Features drainage holes to promote drying and reduce debris buildup, supporting consistent 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 differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement may vary by +/- 1-3 cm.