Suction Capacities 2.98 to 600 m3/hour Ultimate Vacuum upto 0.005 torr in Double stage and 0.05 torr in single stage Available in Belt & Direct driven optionsTest Tube Stand Aluminum: Diameter of Holes – 12MM, 15MM, 18MM, 25MM, 32MM, 38MMTest Tube Stand S.S.: Diameter of Holes – 12MM, 15MM, 18MM, 25MM, 32MM, 38MM