Ergonomic snap design,don’t choke hands,comfortable and effortless. Precise opening of the mold liner,e ffectively fix the product,prevent collision damage between instruments. Suitable for optical fiber cold connection construction and optical fiber signal detection. High-density sponge lining protection,5 meters drop resistance. Suitable for optical fiber communication engineering,transmission room,laboratory, optical fiber network inspection and maintenance. Waterproof and wear-resistant,strong and durable can be cross-carried.