1. material : spring steel 2. heat treatment: hrc40~50 3. surface: zinc plated 4. finish : carton packaging 1. Item name: clip from china2. Material: stainless steel, iron, copper, aluminum, carbon steel3. Surface treatment: nickel, white zinc, blue zinc, color zinc, yellow zinc, black zinc, chrome4. Standard: JIS, BS, GB, ISO, DIN, AISI5. Size: all sizes6. The use of this product is very broad, ...