LC connector cleaning pen, which one is it? Alcohol? Regarding fiber optic cables, we generally use Finit here. Fiber optic adapters (also known as flanges), also called fiber optic connectors, are the centering connection components of fiber optic movable connectors. The series of products include: FC. SC. ST. LC. MTRJ. They are widely used in optical fiber distribution frames (ODF), optical fiber communication equipment, instruments, etc. Superior performance, stable and reliable.