Reduced Minimum Collapsed Height
Adjustable Steel Housing
This CRL Sliding Patio Door Roller has two 1-1/4 inch (31.8 millimeter) diameter
steel ball bearing rollers. This housing is identical to the D1988 Roller. The
rollers are smaller in diameter allowing this roller housing assembly to have a
minimum collapsed height of 1-1/4" (31.8 millimeters). This shorter overall
height is necessary for some door applications where there is very little door
top rail to header clearance preventing the door from being lifted off of the
track high enough to allow the D1988 to be installed. The steel housing assembly
is 11/16 inch (17.5 millimeter) wide and one inch (25.4 millimeters) tall.