BottomlessTM wrench design uses a much stronger heavy duty snap
ring which is mounted on an outwardly facing surface of the gear wheel, not
in the hole of the wrench head.
As such, the ring can expand outwardly when a
socket is inserted into the wrench head. This freely permitted expansion
allows the heavy duty snap ring to snap back forcefully into the holding
grooves on a socket when it is inserted into the wrench. As a result, the
heavy duty snap ring firmly holds the socket in the wrench head, much more
firmly than is possible with conventional pass through wrenches. Would you
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U.S. Patent No.