Carpet Fastener, 3 Pronged, Black Oxide Finish, w/ 3/8" Screw Stud - 1 Each These fasteners are easy to fit. Simply push the ring with the three prongs through the carpet and then through the slots in the socket and bend prongs over. A pair of needle nose pliers is helpful. Prong length is 1/4" Inch, (8mm). Determine where you want to place the stainless steel stud and fasten it down using a #2 Philipps head screw driver or drill tip. Buy as many as you need. We Ship Internationally! Northwest Tarp Canvas Check Out Our Quality Weather Resistant Tarps! Have a Nice Day!