Knape & Vogt 1175P ZC 

22-5/8'' Drawer Slide, 50 lb, Center Undermount Mounting, 22-5/8'' in L Rail, 1/2'' in W Rail, Steel

2-PACK

Light-duty slide designed for general drawer applications. Mounts with staples or screws. Height of 1 in. Required Clearance:1/8 in each side, 1-1/2 in from rear of drawer to cabinet, drawer to be 3/8 in shallower than opening. High-density polyethylene rollers. Drawers lift out for easy removal. Packaged with screws and installation instructions.