According to our records, this business is located at 4187 State St. in Montclair (in San Bernardino County), California 91763, the location GPS coordinates are: 34.0587019 (latitude), -117.713688 (longitude). Gem Steel Co Inc is categorized under Boat and Barge Sections, Prefabricated Metal (SIC code 3441). Known organization president is William Yoss. Current estimates show that the unit has a sales volume of $2,190,000 and staff of approximately 10 people. You can contact the company by phone at (909) 591-6544; the following fax number is also provided: (909) 590-0804.