USED “OPTIMUM” COLUMN DRILL SoldOpportunity: Used column drill with gearbox, OPTIMUM brand mod. B-40 (Ref. 375). Used column drill with gearbox, OPTIMUM brand mod. B-40 CHaracterIstiCs Column diameter: 150 mm Drill capacity: 40mm Drive power: 2 Cv. Spindle cone: CM 4 Cooling pump: 0.5 Cv Year of manufacture: 2007