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 CameraFront mount: for Canon EF mountRear mount: for Canon EOS M mountTripod screw: 1/4 screw Max. diameter and length: 7.2 * 8.4cm / 2.8 * 3.3inPackage size: 12 * 10 * 6.5cm / 4.7 * 3.9 * 2.6inPackage weight: 300g / 10.6ozPackage List:1 * Lens Mount Adapter 1 * User Manual(English & Chinese)