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
10-16x16 Hex Head Self Drilling Screw for Metal Galvanised
Hex head self drilling for metal 5/16 Head. 10 = the screw gauge, 16 (middle number) is the threads per inch. And 16 last number is the length and includes the cutter.
Driver bit click here
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