1. heat Treatment: HRC40-50 2. Hardness:HR300-500 3. Strict inspection process 1. Material:stainless steel,carbon spring steel Surface:zinc, dacromet, black, copper plating, etc 2. Speed clips are used with machine screws and sheet metal screws. They are pressed into a locked position over a panel edge and holds itself in position to receive a screw 3. Our company specializes in manufacture various kind of fasteners and metal stampings,with resonable price,high quality It specializes in manufacture various kinds of stamping parts with resonable price,high quality,various kinds,various materials,various ways of treatments. We not only supply standard one but also supply special one according to customers drawings or samples. According to customer's request.