Original plastic hub rings are countersunk and use pan head screws. The metal hub rings pictured on Revain are countersunk for countersunk screws. The screws pictured and provided are round headed and are too short to have enough threads to securely hold a heavy soundbar. The supplied metal hub rings are not countersunk. My original flat head would work fine with the metal bushing rings countersunk. I don't know what the wall mount screws are for. My soundbar requires 2 for each hub ring. A complete waste of money.
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