Comparison : Item # CAL2-470-2.0, CAL Series - Steel (Metric)
Item # CAL2-580-3.3, CAL Series - Steel (Metric)
Item # CAL2-470-2.0(mt.60), CAL Series - Steel (Metric)
Item # CAL2-580-3.3(mt.60), CAL Series - Steel (Metric)
Item # CAL2-610-4.2, CAL Series - Steel (Metric)