The AD-HSS is the same as our AD-HS but designed with a stainless steel square mounting plate. It is made using our BA-HS ball mount, stainless square bottom plate, thumb screw and angled holding plate. Also comes with a small safety lanyard. Made out of 6061 T6 aircraft-grade aluminum with Type III anodizing, 316 stainless steel bottom plate and angled holding plate and plastic thumb screw.