Compact Hand Tapper on Magnetic Base ~ Compact & portable. ~ Maximum stroke is 2.36″. ~ Mag base is 2.36 X 2.36 X 2″. ~ Tap capacity is M3-M12. ~ Powerful 175 lbs. permanent magnet with on/off switch. ~ Drill chuck enables the tap to be easily loaded and removed. ~ Suitable for large workpieces like machine cases & thin plate tapping jobs.