Great tool! Just the right size and my wife loves it. Updated: 04/14/2016. I am assuming there is more than one manufacturer of this product as mine is not chrome plated as shown in the picture. This is galvanized steel. It is not hollow throughout. The end of the socket is 3/4" deep, perfect for a 3/8" socket handle. The end of the plug is 3 1/2" deep - enough for a spark plug. The rest is solid. It doesn't have a rubber guide plug; it's magnetic. Still a great tool that my wife and I use together.
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