Even a well made Barlow little damage on the imaging quality More magnification for existing eyepieces to see the details of moon and bands of Jupiter clearly;the Barlow lens is a must Quality and value high power 5x Barlow lens to give a big magnification boost to any 1.25 inch eyepiece It help double the capacity of an existing set eyepieces at the cost of a single eyepiece;It's super easy to use;you can simply insert eyepiece of choice into the Barlow lens;then insert it into the scope Barlow lens could also provide more magnification without reducing the exit hole on the eyepiece Magnification: 5X Lens material: optical glass lens Lens coating: Broadband coating Thread specification: M28.5x0.6 pitch Appearance color: black Interface size: 1.25 inches (about 31.7mm) Material:Aluminum alloy colour:black Package Contents: 3pcs 5X Barlow Lens Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.