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American Open Hole (A.O.H.)

PMC Lone Star manufactures American Open Hole (A.O.H.) gages for sizes from 2-3/8 to 4-1/2 inches in diameter.

AMERICAN OPEN HOLE (A.O.H.)
SIZET.P.I.T.P.F.
2-3/841-1/2
2-7/841-1/2
3-1/241-1/2
441-1/2
4-1/241-1/2