Tether Tools Rock Solid PowrGrip 4.5 Tether Tools Rock Solid Vacuum PowrGrip - Ballhead Assembly - Pad Protector - Tether Tools Warranty Mounting pad 4.5" (11cm) in diameter 1/4"-20 ballhead assembly for versatile mounting options and angles Removable ballhead assembly to attach other 1/4"-20 accessories Compatible with Wallee Connect or Connect Lite (sold separately)