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Even thought these chairs are designed for #4 rebar (1/2") they will certainly support #3 rebar (3/8"). #4 will "snap" into the clips molded into the top of the chair and the #3 will "fall" into the molded clip but, will still adequately support the bar.
The #924 is designed for #4 and #5 Rebar.
Not designed for wire mesh. Thank you for the question. Hercules Chair!
It will fit within 16 inch forms or wider.
Check the company website for recommended spacing. I placed mine every 1 to 3 feet and it worked well. Hercules is the manufacturer.