Fangrui Product Details Fangrui Product Details Fit For 40mm Flat Tracks: Designed To Seamlessly Integrate With Your Existing Setup. High-quality Construction: Made From Durable Materials That Withstand Frequent Use. Easy Installation: Simple Setup With All Necessary Hardware Included, Allowing For A Quick And Hassle-free Installation. Upgrade Your Barn Door Hardware With Our Reliable And Efficient Door Stoppers, Ensuring Longevity And Performance. Enhance The Functionality And Safety Of Your Sliding Barn Doors With Our Adjustable Door Stopper, Specifically Designed For 40mm Width Flat Tracks. This Essential Part Ensures Smooth Operation And Prevents The Door From Sliding Off The Track. Colour:black Material:plastic Package Contents: 1 * Sliding Barn Door Stopper Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.