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 8mm ring Spanner and an 8mm socket drive to tighten your nuts onto bolts. All Trampa Bolts are dipped in Blue "locking paste" whilst all nuts have the famous "Nylock" locking system to ensure the most secure of fixes possible. The shanked bolt reduces vibration abration from rough terrain riding giving extra durability to the deck. Using A2 marine grade Stainless steel to provide the finest quality nuts and bolts, this 8 piece set consists of M5 x 30mm spanner headed Shanked bolts with Blue locking paste, 5mm nylock nuts and 5mm form B washers. Perfect for the Trampa deck and an important upgrade when converting your trucks over to a new Trampa deck. The Bolts have a 16mm shank (smooth side, no thread) which means the section of the bolt which passes through the Trampa deck has smooth sides. This eliminates any chance of abrasion or wearing from the thread of the bolt on the internals of the deck, giving extra life to the deck.... 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.