trying to secure 9mm yellow tongue to 4mm C channel, which self screwing screw do you suggest?
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Welcome to the Bunnings Workshop community @Grant777. It's terrific to have you join us, and many thanks for your question about securing yellow tongue flooring.
You might like to tell our helpful members a little more about your project. Once they better understand what you would like to achieve, I'm sure they'll have plenty of advice to share.
I presume this is a steel C channel with a 4mm wall thickness? If so, you should be able to use Winged Self Embedding Metal Screws. They'll drill their clearance hole through the timber and self-tap into the metal channel wall.
Please let me know if you have any questions.
noted and will purchase tomorrow via Bunnings in Leopard
appreciated your advice
Keep us updated on your project @Grant777, and please let us know if you run into any issues.