Larry's homemade unit is designed as the original OEM Ford socket, with external teeth.
While certainly functional, it is known to slip off the nut, or to shear off one of the four teeth.
There is an improved version that hopefully is the only version still being sold by the vendors.
I bought mine from Mark Johnson at IPSCO. One-man machine shop with excellent attention to detail and quality.
Socket accepts a 3/4" drive, or a 1 1/4" socket.
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