now I'm speechless. Many reviews have stated that these splints are not as smooth as other products. I took the opportunity to order with an assessment of the excellent build quality. Standard ball bearing guides usually only need 1/2 inch for each side that I have. These guides were so tight they broke on the side of my 1st draw. I tried to contact the seller but never responds to help. My installation The instructions that came with are useless Was really going to send them back but they are heavy and didn't want to waste any more time If you end up with these rails re-grease those bearings Very awful when I can barely look at those bearings Grease