Blueprint: B=40mm C=12mm J=4mm D=15mm E=2.7mm G=M5Description:Widely used in hardware,molds, and the event of the mechanical transmission.Whether typical parts: typical partsMaterail: Carbon steelBore Diameter: 12mm with 4mm keywayTeeth Number: 36Pitch: 6.35mmIf you would like different bore or different Chain Drive Sprocket,please contact us.Package include:1* Chain Drive Sprocket2* Setscrews1* Allen Key1* Flat key