2 PRONG TO 3 PRONG ADAPTER connects a grounded electrical cord to an AC outlet without a grounding pin slot; Ideal solution for older houses or offices with AC outlets that do not accept grounded power cords two prong to three prong adapter converts a 3 prong grounded plug into a polarized 2 prong plug; Grounded protection is maintained by connecting the metal clip on the 2 to 3 prong outlet adapter to the middle screw on the faceplate of a grounded outlet box COST-EFFECTIVE 10-PACK of 3 to 2 prong adapter provides spare adapters to carry in your toolkit or laptop bag when traveling; A lifetime warranty is included with this three prong to two prong adapter SIMPLE INSTALLATION of 2 to 3 prong adapter that plugs into any polarized 2 prong outlet; Simply attach the grounding clip to the screw on the outlet when installing STURDY & SAFE construction of this grounded outlet plug adapter includes a 15 Amp / 1875 Watt power rating, a grounding clip, and a rugged surface with ea