【Main Material & Surface】Black frosted, high quality carbon steel, corrosion protection, environmental protection, non-pollution.
【Design】Track and roller arm thickness: 0.23 inches, very sturdy. Screws: 8.8 grade high strengh bearing capacity. Stopper: rubber covered, good buffer effect, reduce the noise. 【Roller bearing】High purity bearing steel Gcr15, passed the test of opening - closing for 100000 times, wear-resisting, ensure the stability of the move and the wheel's fluency. 【Product】We are professional factory, product has been tested and verified several times, accept custom-made barn door hardware. Our instruction are illustrated in inches, easy to install. 【Service】5 years warranty, 100% money back guarantee, 24 hours online customer service, if any part missed or broken, we will ship out from U.S warehouse ASAP. Any problem in using it, our professional staff in the barn door hardware field will answer questions for you.