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Knapp Lacrimal Sac RetractorNewMed® Knapp Lacrimal Sac Retractor is a precision surgical instrument designed for lacrimal sac procedures. Measuring 14cm, 15.3cm and 16cm in length with a rigid or flexible shaft, it features 1, 2, 3 and 4 blunt or sharp prongs and is 5.0mm, 6.0 mm and 8.0mm..