Features: Simple and practical, easy to install All-metal texture, strong and durable T2 T-ring adapter: Useful accessories allow you to connect your camera to binoculars, camera adapters and other astrophotography accessories. Usage: Screw the T-shaped adapter into the T-ring adapter, and then screw the whole installation adapter into the DSLR/SLR to connect the telescope/microscope. Both sides of the hollow part of the sleeve do not affect the adjustment of the focusing handwheel. Specifications: Material: aluminum Tube length: 2.76inch/7cm Diameter: 1.616inches/4.1cm. Thread: Both adapters are universal M42x0.75 thread. Package Includes: 1pc Photo sleeve 1pc T-ring adapter note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.