Rev-A-Shelf's 4KCB-18 wood classic knife holder/cutting board combination turns a drawer into a knife holder with built-in cutting board. The kit comes complete with a knife rest, vegetable oil treated cutting board, full-extension slides and mounting hardware. The unit is designed for 18-in. base cabinet drawers. and requires 4 3/4-in. inside drawer clearance and 22 3/4- to 24-in. cabinet depth.