Power surges and lightning strikes are not the only things that can damage your home workshop equipment. Simply switching your workshop tools on and off can create electrical imbalances that could cause cumulative, permanent damage to your valuable equipment. SurgeMaster with metal case provides clean, safe power for workshop and other electronic devices. With a rugged metal casing surrounding its advanced elements and superior circuitry, it offers the most complete protection available from power surges, AC contamination and spikes.