The Tiger Claw hidden fastener system includes a pneumatic installation gun and clips that engage the slotted edges of deck boards. The Tiger Claw gun has a nosepiece that consistently holds fasteners in the correct position and fires a Scrail (screw-nail) through the clip and into a joist. FastenMaster says an installer using the gun can lay 400 square feet of decking in an hour. FastenMaster, 800.518.3569,