Purchase Notes: The size of the triangle belt is split into metric and imperial systems1. The length of the metric components is elevated by 0.5 meters, such as: A-500, A-550 ..... A-3500, A-3550 (the identical applies to B belt/C belt/D belt).2. Inch size 1 inch = 0.254 meters in increments, such as: A-20, A-21, A-22...A-80, A-81 (same for B belt/C belt/D belt) .3. Convert from imperial formulation to metric system system (Note: the conversion system will have a slight error)A Type : (Model-1) *25.4=Metric length, B Type: (Model-2)*25.4=Metric size Product Description: Name: V-beltMaterial: High-strength polyester rubberTypes: A TypeSize:Width 13mm,Thickness 8mmTorque: 3500r/ minPower: 25N/MTemperature: 75°CFeatures: gentle transmission and occasional noise ,good wear resistance, solid frictionStop condition: The sample belt stops operating when it reaches the set value of 4% slip rate.Uses: widely used in automobiles, industries, household appliances, agricultural equipment, etc. Package Include: According on your Choose !