roller chain 1.standard :ISO/DIN, ANSI. 2.professional roller chain and sprocket 3.zinc surface or other as customer require ... , we have experience on any the sprocket standard (ANSI/ASA,KANA,ISO,DIN,BS and so on), and now we have build ... warmly welcome OEM inquires.Materials: carbon steel, stainless steel Standards: ANSI, DIN, ISO, and BS Type: DIN766, DIN763, DIN5687, DIN82056, DIN5686, DIN5685, ...