Specification: Origin: Mainland China Colour: Black Material: aluminum alloy Compatible lenses: EF/EF-S series lenses Compatible cameras: Compatible for Canon R series cameras Front mounting: Compatible for Canon EF mount Rear installation: Compatible for Canon EOS R mount Tripod slot: 1/4 standard interface Is the base detachable: Yes Size: 82*70*30mm/3.23x2.76x1.18inch Net weight: 94.5g Install the product: (1) Install the Compatible for Canon EF lens into the mounting slot on the adapter ring, align the installation mark on the Compatible for Canon EF lens with the same mark on the adapter ring, and then turn the lens clockwise until you hear a click. (2) Align the installation mark (red circle) on the adapter ring with the same mark on the camera, install the adapter ring into the camera, and then turn the lens clockwise until you hear a click. Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Adapter Ring 1 x Wrench 1 x User Manual