About this itemMATERIAL: Composed of high energy 410 stainless-steel to supply strong durability, corrosion resistant.WORKMANSHIP: Adopting warmth handled and high-precise chopping technology, the screw thread is awfully sharp, clean and clear. And the phillips groove of truss head is deep to avoid stripping off.APPLICATION: Screw the self tapping screws directly into sheet iron or plank with drill point, shouldn't have to drill holes upfront and might obtain the effect of connection. Mainly used for iron panel, metallic plate, aluminum panel, wood, plastic sheet, composite board, etc.WARM TIPS: Ensure safe holding, demanding to slide and warp when using. And the product can't be used for stainless-steel sheet.