Grizzly 140020 Tapping Attachment Turn your drill press into a tapping machine adjustable internal clutch mechanism lets you tap 3/16-Inch - 1/2-Inch (m5 - m12) threads MT #2 arbor Adjustable internal clutch mechanism lets you tap 3/16-Inch - 1/2-Inch (m5 - m12) threads MT #2 arbor