material: carbon steel, alloy steel etc heat treat: hardening and tempering, high frequency quenching etc standard: DIN, ANSI 1. Sprocket: all sprockets we are supplying are suitable for chains made in accordance with standard DIN 8187 or ANSI, from simplex, duplex to triplex.2. Material: alloy steel, carbon steel, stainless steel, hardened & tempered steel, cast iron, aluminum, copper, brass and ...