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SPECIAL GAGING INSIDE DIAMETER DOUBLE-TURRET GAGES
This gage was designed to fit through a diameter much smaller than the one to be gaged. A double-turret gage can check an I.D. up to two times larger than the hole it will pass through. Single-turret gages can be designed for I.D.s up to one and one-half times larger than the hole it will pass through. Accurate gages have been supplied that will reach 36" deep.