Ergonomic snap design,don't choke hands,comfortable and effortless.-Precise opening of the mold liner, effectively 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