step screw-internal teeth special electronics fasteners

step screw-internal teeth special electronics fasteners size:M5*30 surface treatment:black zinc plated material:10B21 class:8.8 1.Product:Baosteel raw material make sure the product good toughness and high strength,quality meets the demand of International European Union standards. 2..Application:this kind of product is for electronics-TV and computer accessories,display assembly,telecommunication equipment . 3.we also can give your suggestion and design according to your