Power surges & lightning strikes are not the only things that can damage your home workshop equipment. Simply switching your workshop tools on & 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 & other electronic devices. With a rugged metal casing surrounding its advanced elements & superior circuitry, it offers the most complete protection available from power surges, AC contamination & spikes. Number of Outlets: 10 AC; Joules Of Surge Protection: 885 J; Lines: 3; Protection Type: Power.