... Center, EDM 3. Heat treatment, steam treatment 4. Steel Gear and Sprocket Wheel Hefei Bolin Advanced Materials Co., Ltd. was ... working workshop have great strength in processing capacity. This steel gear and sprocket wheel is made by gear shaper in house ... Material: Cast iron, Carbon steel, Stainless steel, Alloy steel, Non-ferrous alloy. We appreciate your enquiry and will do our best to cooperate ...