labeled Indestro Chicago USA
one end 1 ?/32 other end 31/32
no square dive , hollow all the way thru.
must have used small bars to turn it?
spark plug socket?
plumbing?
good to have TT back again!!
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I have a stamped steel valve (plumbing) socket that is similar sized 31/32 x 29/32 but there is a 1 1/32 so it could be 1 1/32 x 31/32.