Utilizing a strong electromagnetic base, it can be adhered tight to carbon steel surfaces, even upside down or vertically, then used to drill holes of up to 5-1/8″ (130mm) diameter and tap holes of up to 1-5/8″ (40mm) diameter.
The mag drill can bring the clean, convenient performance of a stationary drill press to any point on a construction site.
Professional Power Tools – The Complete Guide to Mag Drills