Olympus 150 Series Knurled Nut This knurled nut is a compatible replacement part for Olympus 150 series flexible endoscopes (GIF-150 CF-150). The knurled surface provides a firm finger grip for tightening threaded connections in the control section. Key Features Precise threading for a secure fit Corrosion-resistant stainless steel Knurled surface for easy manual tightening Direct-fit replacement, no modification required Specifications Compatible Model GIF-150 CF-150