These 1 1/2" Stainless Steel Deck Bolts come standard with locking nylon nuts. This Pontoon Deck Bolt has a 1” flat head with teeth that will lay flat on the deck, allowing your carpet to go down flawlessly. Pre-drilling is required on this stainless steel deck bolt. Space these holes approx. 12" - 16" apart. Place your new deck bolt through the newly drilled hole and proceed to the underside of the boat to secure the bolt. Dimensions: 1/4" - 20 x 1 1/2" Flanged Stainless Steel Deck Bolt 100 per pack Great for Saltwater Applications