SIRUI EF-E Adapter perfectly fits with SIRUI Jupiter Lens series, allowing you to easily adapt the lenses to use on Sony E mount cameras. Constructed with high-quality aluminum alloy, the EF-E adapter measuring 8.37*7.31*3.67cm (3.3*2.9*1.5?) and weighing only 170g, is to be lightweight and sturdy for a long-lasting application. Designed with a mount adapter base with a built-in 1/4' screw hole to keep the whole setup in balance, providing effective protection for the lens and the adapter of the camera. Easily attach this adapter by aligning the red dot on the adapter with that of the lens mount and twist clockwise to the end.