Features: EF-M adapter is able to adapt EF/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. 1/4 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: 1/4 screw Max. diameter and length: 7.2 * 8.4cm / 2.8 * 3.3in Package size: 12 * 10 * 6.5cm / 4.7 * 3.9 * 2.6in Package weight: 300g / 10.6oz Package List: 1 * Lens Mount Adapter 1 * User Manual(English & Chinese)