Depends on what kind of steel: 18 Gauge Standard Steel is .0478 Inches. 18 Gauge Galvanized Steel is: 0.0516 inches thick. FYI 18 Gauge Aluminum is 0.0403
24 gauge stainless steel is 0.0250 inches thick.
18 swg is 1.22 mm thick
11 ga stainless steel is 0.1250 inches thick
0500 inches.
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