These tools are not intended for use with live human tissue or liquids or human material unless specifically described for that purpose. 13533 Alderdyce Elevator/Dissector, stainless steel. Tips 4mm x 12mm (0.16" x 0.47") and 3.2mm x 6mm (0.13" x 0.24"). Overall length 210mm (8.25"). 13556 Milligan Neuro Dissector, stainless steel. Tips 6.2mm x 12mm (0.24" x 0.47"). Overall length 210mm (8.25"). 13558 Sachs Neuro Dissector, stainless steel. Tip 5.3mm x 12mm (0.21" x 0.47"). Overall length 210mm (8.25"). 13559 Sachs Neuro Dissector, stainless steel. Tips 4.9mm x 12mm (0.19" x 0.47"). Overall length 220mm (8.7").