Comparison : Item # SS-2M0-6-2, Union - Metric/Fractional
Item # SS-2M0-6-4, Union - Metric/Fractional
Item # SS-3M0-6-2, Union - Metric/Fractional
Item # SS-4M0-6-2, Union - Metric/Fractional
Item # SS-4M0-6-4, Union - Metric/Fractional