PLEASE READ OUR “SCREW SIZES” BEFORE ORDERING THE LOCKNUT and WASHER SET. Make sure the headboard or footboard has holes that penetrate all the way through the leg. It needs to be able to accommodate a bolt passing through the entire leg. Measure ¼” X 2 ¼” Max Easy to use for bed frame modification, hardware to connect odd size bed frame to headboard/footboard Our package is designed to fit most headboards or footboards. Whether your headboards max 2 ¼” thick. Our complete kit includes 2 different length bolts, so you get it right the first time, It includes Four ¼” x 2½” bolts for headboards. Also included is four ¼” by ¾” bolts to accommodate the Modi-plate to the bed frame. This set is for headboard OR footboard only, if you need to connect both headboard AND footboard, you will need to purchase our 64 PC set Asin # B093JCZJYC Hassle free, just use Phillips screwdriver and wrench or plier to mount and disassemble the bed rail fittings, quickly and easily. Headboards or headboards and footboards can be connected in many ways, but simply fastening them up with nuts and bolts is one of the proper and easiest and most trouble-free methods to attaching them securely. You simply need a steel bed frame with one of our mounting Modi-plate. It should have aligned holes with your headboard or slots that give you more versatility to fit a greater variety of beds and bed heights. You simply align the holes in the mounting Modi-plate with the holes in the headboard/footboard legs and push the screw through the leg of the bed. Slip the washer over the shank of the screw and then thread on and tighten the lock nut. Our complete kit includes 2 different length screws. No need to guess and risk having to return if you check in advance the thickness of the headboard. They are good for wood-to-metal, metal-to-metal mounting plate connections when the head may not be accessible for tightening. Includes: (4) ¾” screws (4) Lock Nuts (4) Washers (For Bedframe to Modi-plate) (4) 2½” screws (4) Lock Nuts (4) Washers (For Headboards to Modi Plate)