Features: EF-M adapter is able to adapt EF or EF-M lens to Canon EOS M mirrorless Camera, which allows you to have more purchasing choices of lens. Maintain of Auto Focus (AF) function. Aperture exactly being aligned via the mount adapter. Built in anti-shaking function. More robust and stronger due to zinc alloy core. Greatest conductivity due to gold-plated pins for the signal transmitting. 1 or 4 Female thread screw for mounting onto the tripod. Note: The AF is slow when use for prime lens ,manual focus would be better. Specification: Compatible lens: for Canon EF series lens Compatible cameras: Canon EOS M mirrorless Camera Front mount: for Canon EF mount Rear mount: for Canon EOS M mount Tripod screw: 1 or 4 screw Max. diameter and length: 7.2 x 8.4cm or 2.8 x 3.3in Package size: 12 x 10 x 6.5cm or 4.7 x 3.9 x 2.6in Package weight: 300g or 10.6oz Package List: 1 x Lens Mount Adapter 1 x User Manual(English and Chinese)