12-14x75mm Self Drilling Screw for Metal Hex Head Galvanised with Neo Washer

8-18x12 Hex Head Self Drilling Screw for Metal Galvanised

Hex head self drilling for metal 1/4 Head. 8 = the screw gauge, 18 (middle number) is the threads per inch. And 12 last number is the length and includes the cutter.

Link to correct driver bit here

suite 12 guage screw

12-14x35 Hex Head Self Drilling Screw for Metal with Neo (Rubber Sealing) Washer Galvanised

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Wing Teks self drilling for metal zinc plated