This Enerpac SPD-313 round punch and die set works with the Enerpac SP-35S hydraulic punch (sold separately) creates 5/16" (7.9 mm) diameter holes in material. The holes fit 1/4" bolts. Material thickness should not exceed hole diameter.
Enerpac manufactures high-pressure tools and equipment for industrial applications. The company, founded in 1910, is headquartered in Menomonee Falls, WI.