Fits on all steel Holman shelving units. Each drawer is coupled with smooth-sliding heavy-duty ball bearing rails that hold up to 40lbs. The individual latches keep drawers secured and provide easy access with just a quick slide of a finger. Large drawer inner dimensions are 16" W x 12.7" D x 5" H, small drawer inner dimensions are 16" W x 12.7" D x 2.5" H.