All of our hardware kits come with a concealed T-Guide (click here for more info). The T-Guide is mounted on the floor and fits into a slot cut into the bottom edge of a sliding door. We also have a C-Guide option that doesn't require modifying the door bottom. The C-Guide cups the bottom of the door, holding it in place. C-Guides are available for doors 1" or thicker. We also offer a wall-mounted roller guide for applications where it is difficult to mount a guide to the floor. It is ideal for outdoor settings and/or doors up to 2-3/4" thick. concealed-t-guide-detail.jpg