DC Cargo Mall 4-Pack Black Trailer Mounting Backplates for D Ring Tie-Down Square Recessed Pan Fitting Bolt-on Installation NOTE: recessed tie-downs and mounting hardware is sold separately on Amazon or as a bundle kit but is NOT included in THIS product. When you need to safely transport your motorcycle, snowmobile, landscaping equipment, farm tools, etc, HEAVY DUTY SQUARE RECESSED TIE DOWN ANCHOR D RINGS are the absolute elite in superior tiedowns; fairly simple to install, offer A LIFETIME OF DEPENDABLE STRENGTH AND VERSATILITY and MOUNTING PLATES OFFER INCREDIBLE SUPPORT, backing to trailer tiedown anchors! THIS KIT INCLUDES 4 TRAILER MOUNTING BACKPLATES THAT ARE COMPATIBLE with small and large square recessed D-ring tie-downs with countersunk or square carriage holes (DC Cargo Mall parts # PF21, PF22, and PF23). These 6.5" x 6.5" tie-down support plates are made out of DURABLE BLACK STEEL that is 1/10" thick and each backplate has a 3.5" diameter open circle through which the tie downs should be inserted; SEE THE TECHNICAL SKETCH IMAGE ON THE LEFT FOR A VISUAL GUIDE to this products dimensions Place a backplate over the area where you wish to install your recessed tie-down and draw diagonal lines from hole to hole to achieve that perfect center spot; then use a hole saw and chisel to create the correct size pocket (be careful to measure the Dring pan fitting tie down carefully and look at the technical sketches), with a depth that advances from 9/16" deep to 1-1/8" deep because the recessed pan fittings are deeper on one side Once youve created the hole needed to insert a RECESSED D RING TIE-DOWN, put the pan fitting in its place and drill through the bolting holes; then hold A MOUNTING PLATE ON THE UNDERSIDE OF THE MOUNTING SURFACE (YOUR TRAILER, TRUCK BED, OR TABLE) and insert the appropriate bolts into the 4 holes, securing with lock nuts and washers This product includes 4 D ring backplate supports for installation on trucks or trailers; if you have any QUESTIONS, COMMENTS, OR INTEREST IN BULK/CUSTOM ORDERS, our customer service representatives are ALWAYS HAPPY TO ASSIST and we stand behind our products with a CONFIDENT 100% MONEY-BACK HAPPINESS GUARANTEE!