The Steelmax D1-SM Swivel Base Mag Drill has all the features that make the D1 the go to drill for fabricators with the added ability to easily drill holes on convex (min. diameter 12″) and concave surfaces (min diameter 40″). Four individual swivel magnets adjust to the surface, allowing the machine to work on uneven work areas. Each magnet is equipped with variable holding force features allowing easy machine positioning while the magnets are partially engaged. The magnets work without electricity making a great safety solution for your drilling needs.