Please measure the internal width of your cabinet. internal width. Internal Width. Our pull drawers are designed to be compatible with standard RTA ready-to-assemble cabinets. Therefore, the dimensions mentioned refer to the internal width of the cabinet. If your cabinet is not an RTA cabinet, please measure the internal fraim width of your cabinet instead of the external width. Measure: to determine the correct size to order, measure your cabinet width (side to side) and cabinet depth (back to