The fasteners go on the bottom of the 16in decking boards so you don’t have any nail or screws showing in the wood. The store that ordered them for me will not take them back because they had to order it and they don't carry them. It turns out I have way to many that I don't need. I have 2 boxes of the 100sq.ft that retail for $242.49 I will sell them for $75 obo or make offer I all so have a box of 300 sq.ft that is 1/2 full that the box retail 631.95 but because its 1/2 full I will sell for $200obo or make offer I need to sell them fast I need the money cash only you can E-mail me or call my cell 505-620-7388 john the web site for them is http://www.fastenmaster.com/product.aspx?catID=2&prodID=3 Location: Albuquerque it's NOT ok to contact this poster with services or other commercial interests newmexico