1. This door operator is midsplit direct-current resistance speed-change door operator. 2. the door width: 700/750/800/850/900/950/1000/1050/1100. 3. Material : iron. 4. We can provide many kinds of door operators. 5. We produce it by our factory, so we can provide the best quality and competitive prices. 6. More information pls feel free to contact me.