Hello. The best thing for you to do is take your bracket to a hardware store and get the largest diameter screw you can that will fit easily into the holes. Regarding length, you should try to screw into the wooden studs behind the sheetrock or plaster wall so you will want 2 and 1/2 or 3 inch screws. Be sure to drill a pilot hole for each screw but only go in half as deep as the screw is long and use a bit that is only half as big around as the screw is.
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