Features: The diagonal lens with enhances aluminum molds, which have highly light transmittance Standard 1.25in diameter for 1.25in eyepiece and telescope. With a metal pressure rings; it can prevent damage and scratch mark when the eyepiece is used with the strong stability; Wide 90degree angles; can view correct picture from telescope stand and look down with a comfortable angles; This locking screws which can firmly lock with the telescope and eyepiece; and the installation is stable without shakings and affecting pictures with M 28.5x0.6mm filter thread which support connection of 1.25inches filter; Specifications: Material:Plastic+Metal Connectors Metal Connectors Size:Approx.3.17cm/1.25in Color:Black M 28.5x0.6mm Filter Thread Package Includes: 1x Diagonal Lens note: Please allow 1-2cm errors due to manual measurement,please make sure that you donot mind befores you order. Due to the differences between different monitors, the picture may not reflect the actual item color.