Krishaber-Luer Tracheotomy Fig mm 0 4 Y17.152.04 1 5 Y17.152.05 2 6 Y17.152.06 3 7 Y17.152.07 4 8 Y17.152.08 5 9 Y17.152.09 6 10 Y17.152.10 7 11 Y17.152.11 8 12 Y17.152.12