Strong composition, magnets are used for holding, mounting and fixing; slip proof rubber coated magnets, scratches proof mounting magnets 1/4″ Male Screw to 5.0cm Diameter Suction Head for Sports Camera Sports Camera Holder Multifunctional, 1/4 male screw attaches to tripods or camera, base attaches to iron or stainless steel surfaces Easy to use, rubber coated magnets contain neodymium magnets, the 50mm base with a strong pulling power,for retail fixing and can hold heavy objects without leaving marks on the ferrous surfaces 1/4 male thread for sports cameras, LED task and lighting, tablet holders, equipment, control panel and mounting fixtures