
Extremely flat, non-hollow center. I bought this to loosen two nuts that had less than a quarter inch of bolt sticking out, the socket is very flat and the splines are beveled deep into the socket and won't snag. This works well with external torx screws, but because the center is boxed and not hollow, the nuts won't come loose even if there's a little protruding from the screw. Had to order a deep socket to complete the job.

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