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Black Bear Forge, run by John Switzer, is a one-person blacksmith shop located in Beulah, Colorado. Smith specializes in hardware and unique tools for woodworkers and produces custom forged iron work, standard ironware objects, and accoutrements for period reenactment, hardware and hand forged tools.
The hold fast demonstrated in this video is forged from 11/16" cold rolled steel for a fit in a 3/4" hole.
Info on the difference between hot rolled and cold rolled steel: