Fasco I-Clip for InvisiDeck Hidden Scrail System. Use with Scrail SCPS413FPFCB fastener for the installation of high end decks. 900 I-Clips per box covers approximately 500 square feet of deck. Use with Fasco 11356F Tool or Tiger Claw F-5899 •Use with SCPS413FPFCB Scrail fastener •900 I-Clips covers approximately 500 square feet of decking •Cuts installation time in half •Non-Magnetic Annealed Stainless Steel