Plain Plug Gauge for Jig Body Holes ID Go 12.006 to 12.010 Cyl. 0.002 Len. 150 to 151; with tapping of M2; NOGO 12.190 to 12.200 Cyl. 0.005 Len. 10 to 11 / Std. Gauging area should have lapped finish. Gauge No. PPG 12000.12200