Features: Autonomous replacement, saving time and effort Advantage: Made from premium materials, these inserts and heads are highly sturdy and resistant to breakage. They ensure a reliable and extended lifespan, allowing for consistent performance during fiber optic operations. High reliability, stable performance, long service life. Product installation: Loosen the metal tip, take out the ceramic cores with tweezers, gently insert a new ceramic sleeve by hand, then install the metal tip, readys to use. Applicable to: fiber optic visual fault locator, optical power meter, pda red light machine, etc. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Package: 2pcs Ceramic Tube Sleeves, 2pcs Metal Connector Adapters Package List: 1 Set Ceramic Cores Replacement Parts