Concentrator Tube, 10mL, Graduated, 19/22 Outer Joint, With Out Hooks, 0 to 1ml in 0.1 and 2 to 10ml in 1.0 Subdivisions. Graduated concentrator tubes for use with Kuderna-Danish evaporative set-ups. Tube can be stoppered for storage. Overall height is 100mm. This item comes without hooks.