... -raised spring, drum spring, pagoda spring, recantation spring, unique distance spring, square snail roller spiral power spring, window cracker spring, huge steel spring, plate spring, diaphragm spring, wavy spring, round spring, mold spring, square spring, flat spring ... 0.2 to 75 mn. They use recantation steel, flat steel, all kinds of stainless steel and Sn-Bronze as the raw material. metal spring