 "Canon BG-E16 - battery grip" " Canon grip 9130B001 Digital Camera Accessories CDW.com
"The battery grip BG-E16 features a variety of controls such as a shutter button, main dial, multi-controller, AF point selection button, AE/FE lock button, AF start button, and multifunction button making it ideal for vertical shooting." 
 "Canon BG-E21 Battery Grip (6D Mark II)" " Canon II) – Pictureline