Includes Free Bit M2M - The Ultimate Metal to Metal Screw! NEW!! Our M2M Metal to Metal screw is the perfect option for getting through that heavy gauge steel! Great for metal joists and any job where metal to metal joinery is needed! It’s advanced Tek, quadrex drive & superior strength make this screw a sure win! Use a #2 square. 16 threads per inch. • # 3 Point • Drilling capacity 0.110 (12 gauge) – 0.179 (7 gauge) • Application: low profi le design provides added clearance for standing seam roof or a concealed fastener panel system • Suggested Tool: Electric Screwgun (1800-2500 RPM) with depth sensitive nose piece.