THE LOWER DOOR SLIDE TRACK SNAPS INTO A T-SLOT WITH NO REQUIRED HARDWARE. THIS TRACK IS TYPICALLY USED WITH THE UPPER DOOR SLIDE TRACK TO ALLOW PANELS TO BE INSERTED AFTER THE FRAME IS ASSEMBLED. THE LOWER SLIDE TRACK HAS A RADIUS BEARING SURFACE THAT ALLOWS PANELS TO SLIDE EASILY. THE LOWER DOOR SLIDE TRACK IS 145" (3.683M) AND CAN BE CUT TO LENGTH WITH A STANDARD MACHINING SERVICE.