If you are looking for a locking extension, the Proto J5262 Socket Extension is the tool to have on hand. The heat-treated chrome finish helps to prevent corrosion and rusting. With a length of 12 in., this socket extension will help you reach those hard-to-reach places. It has a 3/8" drive size and female square drive configuration, allowing it to fit securely into your power tools. The output is made of male square with a 3/8" drive size. This Proto Locking Extension is an essential for your toolbox if you work with smaller sized fasteners often.
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