Portable Magnetic Drills Fast, accurate hole cutting on the job site or in the shop! CS Unitec’s portable magnetic drills are ideal for drilling structural steel and virtually any metal. We offer the most compact and powerful series of portable magnetic drills that can drill holes up to 5 inch diameter through 4 inch thick material. All CS Unitec drills are heavy-duty for use in construction and industry. Our complete product line includes electric, pneumatic and hydraulic powered machines, cutters and accessories. They are available for prompt delivery.