System eliminates the damage to deck boards by hiding all fasteners beneath deckboards. Holds boards tight to eliminateany surface penetration. No moisture can enter deckboards or joists and cause nail penetration. No moisture can enter deckboards or joists and cause nail or screw pop-ups or deck rot. No stains or splinters form around fastener holes. Corrosion resistance. Powder coating's natural wood color blends with the understructure of balconies. Contractor pack includes: 100 brackets, (1200) 10 x 1-1/4" deck board screws, (1100) 8 x 1" joist screws, and a pro bit tip. Use the Contractor pack for large decks.