This product is a single-mode optical fiber cable quick connector adapter, mainly made of plastic materials. It is strong and durable, with excellent texture, and can serve you well. Don't need daily maintenance, in the water, the pollution into the dust, users can clean the table of the connector, the connector can be repeated use, cost savings. Features -Color: Blue. -Material: Plastic. -Size: About 5.50X1.00X1.00cm/2.16X0.39X0.39in. -Insertion Loss: <=0.3 . -Return Loss: &gt;50 . -Length: 50mm. - They also feature a creative collet that ensures precise connections in high vibration environments. - Commercial applications. They are an excellent companion of bulk fiber optic cable single mode. - Single mode connectors are suitable for local area networks, wide area networks, metropolitan area networks data center, business. - Professional and practical design with beautiful appearance, easy to carry and use. - Quickly in the connector plug loss less than 0.3 , is the loss of similar product. Package list: 10 x Fiber Optic Connectors