CompX Timberline File Frame Systems. Cut-to-size kits for drawers with inside depth of less than 23". Kits include all components needed to offer front-to-back and side-to-side filing. Two kits can be combined to accommodate lateral filing drawers. Files slide smoothly on the black rails. Easily installs using only screws. Rails snap in and out of positon without tools. Kit includes: 2 attachment rails, 2 cut-to-length 26" side rails, 1 cross rail and 2 cross rail clips. Letter Size: 12.153" rails.