Bed Claw Universal Footboard Attachment Kit, with Combo Bag Hardware These footboard brackets attach to your existing headboard-only style bed frame allowing you to attach a bolt-on footboard. Universal Footboard Attachment Kit designed to fit Twin, Full, Queen, or King Size Beds. Extension rails made with 12 Gauge steel and powder coated for long-term durability. Footboard brackets made with 14 Gauge steel. Includes two Bed Claw Universal Extension Rails, Two Footboard Attachment Brackets, Instructions, and all necessary Hardware. Requires two 7/16" or adjustable wrenches (not included) for installation. This kit requires your bed frame to have two pre-drilled holes at the footboard end for installation. If your frame does not have holes or they will not match with the many holes on the extension rails, you may need to drill 1/4" holes in your frame for installation.