Accommodates 18 pipettes with diameters not exceeding 10mm, plus 10 pipettes with diameters not exceeding 15mm. Small holes in base allow drainage. Boss head (supplied) allows for the holder to be raised or lowered on supporting rod. Can be used with other supporting rod of 814mm using the olives supplied. Use the custom designed dished base unit with PVC rod (PIP5522) to complete the system.