Feature:
Compatible models: 
Celestron 6SE/ 8SE/ 150SLT/ C6/ C8/ C925/ C11/ C14/ C8HD/ C925HG/ C11HD and other SCT port telescope
Use: For astronomical telescope photography interface SCT to M42 male thread use

Specification:

SCT to M42 Adapter Ring
Interface female thread: M51×1(SCT interface)
External thread depth: 4mm
Flange distance 8mm
Internal thread depth: 6mm
Total length: 12mm
Bore diameter 38mm
Frame diameter: 58.9mm
Material: Aluminum
Interface external thread M42×0.75 MM

Package Include:
1 x SCT to M42 Adapter Ring