Shop › PERIODONTAL KNIVES USC TOWNER 19/20 - 637/20.HL8 PERIODONTAL KNIVES USC TOWNER 19/20 - 637/20.HL8 $44.00 Get notified by email when this product is in stock. Add To Cart Added! Towner USC periodontal knife for gingivectomy incisions. Manually sharpened. DALILA HL8 handle. Product SKU: 637/20.HL8 Towner USC periodontal knife for gingivectomy incisions. Manually sharpened. DALILA HL8 handle. Product SKU: 637/20.HL8