Roll Out Trays Partial overlay cabinet lines; order accoring to the width of the cabinet. EX: ROT21 fits B21 Cabinet. Full Overlay cabinet lines: order according to the width of the cabinet If it is not being installed between hinges . If it will be installed between hinges then order 1 size smaller and use shims for installation (this is done so the tray will clear the hinges when opening). Drawer glide hardware and wood finish fo ROT are the same as the standard drawers in their corresponding cabinet line. May be used in any 24" deep cabinet( Base, Refrigerator Wall, Pantries).