Adjustable With 8 Different Configuration Options: Fully adjustable for doors up to 7.5cm thick. With 8 different configuration options, assemble the floor guide in a style that suits your sliding door. Follow the instructions to install the guide that best suits you and works well on your doors. Flat on the Floor and Flush with the Bracket: This specially designed barn door roller guide has been specially designed so that the bottom bracket of the barn door is perfectly flush with the floor. The wall screws will be flush with the bracket to protect the barn door from scratches. Sturdy and Durable: The rack is constructed from a quality sturdy steel for indoor and outdoor use. The big roller wheel is made of durable plastic that can roll smoothly and smoothly so it won't scratch your door. Package Includes: 1*steel bracket, 2pcs(1*big roller, 2*small rollers, 1*wrench and some bolts). Customer Service and 100% Guarantee: If you are not satisfied with the quality of the travel guide within 30 days, you can return it for a full refund. If you have any questions, please do not hesitate to contact me so that I can help you resolve the issue as quickly as possible.