Arkon SM6HM3 Slim-Grip Headrest Mount for Large Smartphones & 7" & 8" Tablets (sku 19110)SM6 RSHM Slim Grip Ultra Headrest Mount for Large Smartphones & 7" & 8" Tablets. Arkon's Slim Grip Ultra is a sleek holder for just about any mobile device: iPhone, Galaxy S III, Note II, even the iPad mini & Nexus 7. It works with skins and cases; even thick, heavy duty cases. Watch movies, play games or keep your little ones entertained while sitting comfortably in the back seat. Slim Grip Ultra holder works with nearly all smartphones and tablets