?Function? Designed to secure metal bed frames of different widths to headboards, or to secure full-size headboards to large (double) bed frames, and vice versa.Bed frame brackets adapter for headboard extra heavy duty hook on bed rails. ?Universality? The heavy duty bed modification plate design and offset installation can adjust the width of the headboard to match your bed frame. As long as the size difference is within 8 inches, modifications can be made. ?Dimensions? 5 "W x 5-3/10" H (large side) x 3-9/10 "H (small side), 2.5mm thick.Headboard attachment for metal bed framecan improve the stability of the headboard, and the steel is 25% thicker than other brands. ?Material? The headboard adapter kit with hardware is made of high-quality steel, coated with black rust and anti-corrosion coating. ?Widely used? The headboard bracket full to queen conversion kit is very suitable for full (double) size conversion. The bed frame bracket adapter can also be used to convert the king size headboard into a California king size bed frame. This modification board can also compensate for the small size difference between standard bed frames and odd sized antiques. Including: 4PCS Queen bed modification plates, 8 bolts, 8 long screws, 8 short screws, 16 washers, 16 nuts. Easy to Install : Bed frame headboard bracket offset mounting design of bracket allows a wide range of headboard widths to fit your frame.This modification plate can also be used to convert king or cal king headboards to king or cal king frames. When the lateral distance between the bed frame and headboard is longer than 4 inches,our bed frame bracket not compatible, customers need to drill and install by themselves.