
Used this extension when using a Porter Cable model C2002 air compressor (but will work for an electric chainsaw, air blower, etc.) and allows for the necessary extension from the Power source for my project. In terms of gauge (the gauge of wire used in the cable), gauge values start at 10 and go up to 20. The smaller the gauge, the thicker the wire used in the cable. A thicker wire (smaller diameter) allows for better current flow. 10 and 12 gauge wire is ideal if you have powerful power tools. This Otimo extension is a 12 gauge. I like the 25ft extension as it's not so long that it's awkward to use. Definitely recommend.