The manufacturer makes a slotted pole for these steps. If you don't have a slot, you'll either have to make a slot in the nerf bars or cut off the hook. I decided to cut the hook off and then drill through the 1/2" x 4 1/2" stainless steel studs. I have screws to hold it in place if you're using hooks, but I use them to hold the steps in place while I drill and screw them to the rung.
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