Feature:1. ANTI SCRATCH DESIGN: Equipped with three 15mm length M6 screws. Each with a protective head, which can effectively prevent the device from being scratched when fixing.2. FLAT SURFACE DESIGN: It is designed with a flat surface instead of a curved surface where it meets the base, which prevents it from shaking after connection and improves the stability of the connection.3. WIDENED DESIGN: The width of the guiding scope ring is widened to 14mm, which can provide more touching surfaces and make the connection safer and more stable.4. COMPATIBILITY: The 40mm guiding scope ring supports 2040mm diameter telescopes. Compact size, easy to carry. You can put it into your backpack or pocket and take it out to install and use at any time.5. FULL METAL DESIGN: This astronomical telescope guiding scope ring adopts full aluminum alloy design, sturdy, reliable, long service life and not easy to be damaged.Specification:Item Type: Telescope Guiding Scope RingMaterial: Aluminum AlloyHole Support Range: 20-40mm / 0.79-1.57inInner Hole Diameter: 40mm / 1.57inOuter Frame Diameter: 49mm / 1.93inFrame Width: 14mm / 0.55inColor: Red .Package List:1 x Telescope Guiding Scope Ring1 x M6 Screw1 x 1/4 Inch Screw