[High quality material] This hammer head screw made of excellent stainless steel A2-70 with high hardness, which has robust, , outstanding rust resistance and excellent oxidation resistance, which ensures a long service life. [ head screws M8x20 stainless steel] Full thread is that the screws have a head shape of the hammer head and achieve a tensile strength of 700 N/mm2 when screwing.The good holding force in different materials can offer to achieve the effect of the connection and fastening. [Robust and ] M8 stainless steel 2 times harder than copper and ten times harder than aluminum and are considered particularly .Even if it is used in bad weather such as high temperature, moisture or heavy cold, it does not screw or break it easily. [Easy to install] The stainless steel hammer head screws of the precise processing, the screw is neat and clear, and the force is even and not easy to slip, no , can be screwed up free and well screwed together. [Width application] The M8 stainless steel hammer head screws find their applications in metal construction, the assembly of an aluminum profile, the attachment of solar modules and roof hooks for photovoltaics very easy.They flexible screw connections. Colour:As Shown Material:Stainless steel Package Contents: 150 x screws 150 x nuts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.