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)