When using the 1 ½” aluminum bracket it is recommended to use a 1 ¼” pan head wood screw #8 SS with a #2 Robertson driver.
Do not use normal wood screws since with today’s torque of handheld impact drivers, the V-shaped head of a normal screw will go right through the bracket.
When using the steel bracket, you can use any screw (washer or not), lag bolts, and anything in between.
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