84-062 or 84062m, Which is sturdier?

A home owner from USA says:
November 19, 2013
Hi, Was looking at part # 84-062. Wondered if the support material of part # 84-062M might be a little sturdier. Or is the BB wheel the only difference.
Thank you.
Jerry
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Tom from SWISCO responded:
November 20, 2013
Hey, Jerry. Metal wheels are usually stronger than nylon wheels, yes. Keep in mind, though, that the metal wheel of the 84-062M will not hold up as well in a salt-air environment.
Columbia Screen Door Roller, Nylon Wheel
Columbia Screen Door Roller, Nylon Wheel
84-062
$2.79
Columbia Screen Roller, Steel BB Wheel
Columbia Screen Roller, Steel BB Wheel
84-062M
$4.70
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