These loose contacts are used in Powerpole PP-1326 series connector housings and are rated 45 amps. They are Sliver Plated. The 15 amp designation is used to specify the wire size of 20 to 14 Gage.
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Almost every piece of electronic gear I own has Power Pole connectors attached and these 15A connectors from Impulse are the best I've found. I would recommend them as a high quality, easy to use product that does the job.