Easy to Install: Easy to Put Together ( Designed as 2 layer drawer. The small upper box can be installed on the left or right sides.) and Very Sturdy Construction. The Wood Cabinet Roll-out are Very Well Made of High Quality Materials. Easy to Use: Easy to Install, Smooth Slide. No More Bending Down to See What Is In the Back of Your Deep Lower Shelves. Very sturdy Pull out wood Drawer Measurement: When Measuring Depth In an Under-sink Install, Make Sure to Take Into Account Water Cut Off Valves. Heavy Duty:Heavy Duty Made for a Residential Use Item, Strong, Smooth Sliding, Helps Organize and Add a Layer Under Your Sink. (Slide out Shelf) Pull Out Size: The Base Drawer: 12'' W x18'' D x 3''H, The Upper box: 16.75'' W x 6'' D x 2-1/4'' H, Fit for at Least 12 Inch Cabinet Opening ( Don't Forget Your Cabinet Hinge's Thickness)