About this item Universal 2.5mm Ferrules SC/FC/ST Pen is designed for cleaning the ferrule end faces of SC, FC, and ST connectors with UPC and APC polishes. Simple pushing motion engages the connector and initiates the cleaner, automatically advancing with fresh cleaning tape; low cost per clean, up to 800+ cleans. Cleanliness can reach 95% or above. Especially for water and oil, its cleaning effect is far better than traditional swab cleaning rods. Cleaning system rotates 180° for a full sweep; cleaning microfibers are densely stranded and debris-free. FIELD TESTED: This SC & ST cleaner pen is perfect for use in the field. It makes cleaning fiber effortless when working on either single mode, multi mode, Simplex or Duplex connectors and cables. Dimensions: 3.15 x 0.79 x 0.79 inches.