MB1889G=0.0033in MB1890G(F)=0.0033in MB1891P=0.0038in
Grooved Upper Halves, Plain Lower Halves
MB1889G=2.999in MB1890G(F)=2.999in MB1891P=2.999in
MB1889G=0.0007in MB1890G(F)=0.0007in MB1891P=0.0007in
MB1889G=3.188in MB1890G(F)=3.188in MB1891P=3.188in
MB1889G=0.0938in MB1890G(F)=0.0938in MB1891P=0.0938in
MB1889G=3.189in MB1890G(F)=3.189in MB1891P=3.189in
MB1889G=3.000in MB1890G(F)=3.000in MB1891P=3.000in