3 1/2 - 12

PENNOYER DODGE

3 1/2 12 UN 3A LEFT HAND SET THREAD PLUG GAGE 3.5 GO NO GO PDS= 3.4459 & 3.4411 - DW5112RD

SOUTHERN GAGE CO.

3 1/2 12 N 2 SET THREAD PLUG GAGE 3.5 NO GO ONLY P.D. = 3.4383 TRUNCATED CHECK