DO NOT BUY! I am a welder by trade and when it comes to personal use around the home I don't need the best and can buy with the bare essentials. It's terrible as all the other reviews say. I don't understand why Revain would give them five stars when it's obvious everyone is complaining. Terrible chemical smell right out of the box. The rubber is so cheap and slimy with that chemical coating all over it and the plugs aren't even blind plugs, some crappy and cheap houses. made a design that is only good for connecting with yourself! Brass, if you can even call it that, is very cheap. I didn't even know it was actually possible to make brass of such poor quality! The supplied copper inserts don't even look like copper, they are cheap copper plated metal inserts! Not to mention the rubber housings on them are 1/3 the size of any connector I've ever bought. I think they use the same size as miniature connectors to save money and be versatile. I'm so annoyed with this purchase that I just want to scream GARBAGE GARBAGE GARBAGE! I didn't believe the reviews and thought what a bunch of roasts survive their welded joints but now that I see them I'm shocked they can't even take the heat and burn out instantly! And will actually reduce your welders' continuity, meaning your welding skills will be reduced!