How do you easily mount accessories and boxes to your prospeed roof rack? You use the drop in bolts and nuts here! The drop in design eliminates the need to remove your cross bars to slide carriage bolts or slide nuts from the side. There’s no need to open up holes in your extrusions. We offer a 1/4-20 drop-in bolt kit version and a 1/4-20 nut drop-in a kit. Each kit comes with four sets of bolts, washers and nuts. If you want more order 2 for 8 or 3 for 12 etc. You can now mount your gun case, lightings or attach anything else with this hardware kit.