I used a total of 1250 of these hidden fasteners on a 800 sq/ft deck this summer.I used Trex deck boards and these fasteners worked just as well as the Trex brand and at nearly half the price.The screws are not torx (star) drive but they are robinson (square) drive.I think I actually prefer the robinson drive on these smaller stainless steel screws - I didn't strip a single one!And yes, the screws are indeed stainless steel (tested with a magnet) and the head of the screw is painted black so they are as discreet and don't catch your eye at all.