CRIB CONVERSION KIT: This metal crib conversion kit will allow you to transform your 4-in-1 or 5-in-1 convertible crib into a full bed, Bed frame is designed to fit any standard twin mattress (39 in x 75 in), full mattress (54 in x 75 in), and queen mattress (60 in x 80 in); Bed frame requires use of box spring or bunky board (not included) METAL CONSTRUCTION: Adjustable feet match height of cribs mounting holes; Double-ended brackets accommodate headboard (twin, full, queen) and footboard (twin, full only); Bed frame hardware included; Headboard, footboard mounting hardware not included