Hex Self Drill Screw 12-24 x 2" #5 Point 100 Pieces. 12-24 x 2" screw for drilling into up to 1/2" steel. It's hard to believe but these screws will drill into steel up to 1/2" thick. Best results with high speed, impact drivers work well. Perfect for mounting gang boxes, plywood backboards and more to steel columns. FREE USPS SHIPPING! ( USA only ) extra fees apply for international