EASILY ALLOWS A BOLT-ON BED FRAME TO BE CONVERTED FOR USE WITH A HOOK-ON TYPE HEADBOARD OR FOOTBOARDFITS MOST BEDS: APPROXIMATE MEASURMENTS - 6" H x 2 3/8" W x 1 3/8" D. HOOK IS 1" DEEPHEAVY DUTY 100% STEEL CONSTRUCTIONEACH SET INCLUDES 4 BRACKETS, HARDWARE AND INSTRUCTIONSALLOWS FOR UP TO 2" HEIGHT ADJUSTMENT Do you have a hook-in type headboard and/or footboard and a bolt on metal bed frame and want to use them together? Use these adapters to convert your bolt-on bed frame to attach to your hook-in headboard and footboard. It does this using 2 sturdy steel modification plates that hook-in and down over 2 standard pins in the vertical slots of your headboard and or footboard. Looking at your bed frame, headboard and footboard, you will see that the bed manufacturer used one of two systems to connect the bed frame to the headboard and/or footboard. The metal bed frame may have hooks that fit into slots, or they may have brackets for bolts. Hook-on bed frames have "hooks" on the end of the frame that slide into the headboard and/or footboard and usually slip down to lock in place. Those with brackets and bolts, bolt into place. This set provides an easy way to correctly fit and attach most hook slotted twin, full, queen and king size headboards and/or footboards to most bolt-on bed frames. Sold as a set of four. Everything you need is included in the package: four brackets, hardware and instructions. This adapter is for use when the headboard and footboard are strong and stable enough to support the weight of your bed. If you need to be able to adjust the height and width of the connection from the bed frame to the headboard and footboard, then select our BFA 69. FREE USPS PRIORITY SHIPPING! Note, we only ship to addresses delivered by USPS.