
The secret to Spax screws is in the shape of the barrel of the screw and in the shape of the threads. The bottom threads are wavy with serrations which act like a miniature drill to cut right through most materials. The net result is effortless work without having to drill pilot holes first unless you are running them into masonry. That’s right, the same screws work for mounting things to a masonry wall. And oh yes, the same screws work on sheet metal up to 24 gauge without pre-drilling. Are you getting the idea here? These things just work.