Review on DIYHD Top Mount Black Barn Door Hardware Kit For 2 Bi-Folding Sliding Doors - Flat Track Rollers, No Doors Included - 37-3/8 by Samuel Bowen

As another reviewer stated, the 4 lag screws (what holds up the entire door system) are waaaay too short. We installed this system mounting the rail onto a 1"x6" top trim board over sheetrock. After reading another review, we immediately decided to not bother with the included lag screws and replaced them with 5" x 5/16" lag screws from Menards. All of the hardware is well made and heavy duty, so why did they skimp on the most important item? Maybe they don't have sheetrock as a common wall substrate where this door system is made. You absolutely need to get all 4 lag screws buried into either a stud or header or it won't be able to hold the weight of the doors. I love love the look and the operation of the doors is great! Beware if you are not mechanically inclined as the instructions are only pictures with some measurements (mostly in metric). My husband is very handy and definitely saved the project by doing some step-by-step figuring and measuring.