The T-Ring adapter is compatible for all Canon EOS & Rebel SLR/DSLR (not mirror less);the internal thread is known as T or T2 and is M42*0.75 pitch;easily attach telescopes equipped with standard T-threads
The T-Ring is made of metal aluminum;it is hard as a stone and the color will not fade;the one can accompany you and your camera a long time
Connecting your SLR or DSLR camera body to a T-Adapter or other T threaded camera mount firmly; not fall off during use after installation
The package includes a small Allen wrench; you can use it to adjust the angle con conveniently
The adapter has no electrical connection and diaphragm & focusing are required to be set by manual