... : SS, carbon steel, 3.Size: M2-M30, #2-56-1/4-20 4,High quality,cheap price 1.Type: Ball spring2. Material: Stainless ... steel, carbon steel3. Thread Size: M2-M30, #2-56-1/4-204. Finish: Zinc plated, passivated, Nickle plated5. Packing: Outer carton ...