The metal core prevents the screw from pulling through the clip as it is driven into the joist, according to the manufacturer.
The company cites a number of advantages of using hidden fasteners, including a smooth, fastener-free deck surface. No pilot holes are required since the screw is driven directly into the joist, and deck boards are easy to remove and replace as needed, the company said.
Clips are inserted into precut grooves in the edge of deck boards or into slots cut with a biscuit joiner. Two adjacent deck boards are installed at the same time.
A box of 200 clips, 200 stainless trim-head screws (heads painted black), and a Torx driver retails for $100. The company said coverage for 3 1/2-inch boards on 16-inch centers is 73 square feet; on 24-inch centers it's 110 square feet of decking per box. For 5 1/2-inch-wide boards, a box will cover 116 square feet of decking when framing is 16 inches on-center, and 174 square feet on 24-inch centers.
Eagle Claw Tools & Fasteners, www.eagleclawco.com