Need the size

A quick learner says:
What size rail does it hold?
Profile picture of Tom
Tom from SWISCO responded:

The 32-089 socket has an opening that measures 1" tall and 3/8" wide. You can see this measurement on the 32-089 store page, but I will also post it here for your convenience. 

Profile diagram of 32-089
Profile diagram of 32-089
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