Hex Self Drill Screw 1/4-20 x 4" #5. Point Exterior Coated.
50 Pieces. 1/4-20 x 4" 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. Keep a box in your truck, you will find many uses for them.
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