• Front side - M42x1 female thread
• Rear side - Sony E male bayonet mount
• Extension range - from 27mm to 59mm

This is a Chinese product.

The focusing helicoid accepts a lens with Universal M42x1 thread mount, and fits a camera with Sony E mount.

It will be useful for adaptation of lenses or optical blocks that don't have their own focusing mechanism.

The build quality is good. Camera connection is snug and reliable.

Take note that the helicoid minimum length is 27mm, and the E-mount flange focal distance is 18mm.

This means that your lens should have at least 45mm flange focal distance, otherwise it will not reach infinity focus.

If you are going to shoot macro photos or close-ups only, then you can attach a lens with shorter FFD.

The maximum suitable lens FFD is 18 + 59 = 78mm. Lenses with longer FFD will not be able to focus at all, unless you add some M42x1 extension rings.