Trampa use only the finest A4 Marine Grade stainless steel in all of their hardware which means your Trampa can be used and handle the harshest of environments... Use an 3mm Allen or HEX key and a 10mm socket drive to tighten the nuts onto the bolts. These Countersunk bolts will neatly fit bindings to decks within the range of 13-16ply All bolts are dipped in Blue Glue paste to give the ultimate secure fix. All nuts are fitted with the internationally renowned "Nylock" locking system. Using A2 marine grade Stainless steel to provide the finest quality nuts and bolts, this 8 piece set consists of M6 x 25mm Countersunk Allun Key headed bolt with Blue locking paste, 6mm nylock nuts and 6mm form B washers. Perfect for the Trampa deck and an important upgrade when converting your trucks over to a new Trampa deck. By using counter sunk bolts to fit the bindings to the deck we are able to ensure a flush whilst very secure fit to the deck, giving no nasty bolt exposure on the underside of the deck allowing the rider to board slide on any suitable obstacles. The ply of the deck will determine the length of the bolt required as a 12ply Trampa deck is much thiner than a 17ply. Trampa's stainless bolt range ensures a durable, strong and the perfectly neat finish to your deck.a corrosion free, strong and the perfect neat fitting.