A PAIR OF HEAVY DUTY FULL EXTENSION ACCURIDE 20" LONG DRAWER GLIDES-   PART NO.  C3037-20D.  THEY EXTEND  OUT TO 40". THESE ARE UNUSED AND HAVE BEEN SITTING IN THEIR PACKAGE SINCE ABOUT 1980.  I BOUGHT A NUMBER OF PAIRS OF THESE GLIDES WHEN I BUILT THE CABINETS FOR MY KITCHEN.  HAVE BEEN USING THEM FOR OVER 40 YEARS WITH THE DRAWERS LOADED DOWN WITH DISHES AND HAVE NEVER HAD ANY PROBLEMS.