Features: 100% brand new and high quality Inner hole diameter: Approx. 5mm/0.19inch. Simple structure: easy installation, easy disassembly and assembly. Smooth transmission: buffer, strong damping capacity, low noise. The pulley is made of aluminum alloy, with high hardness and high precision. Uses: Widely used in milling machines, gear shapers, drilling machines, gear hobbing machines or other mechanical transmission occasions. Package Includes: 1x 20 Teeth 1x 60 Teeth 1x Closed Timing Belt Specifications: Material: Metal + Rubber Belt Width: Approx. 6mm/0.23inch Type A: 20 Teeth Inner Hole 5mm/0.19inch+60 Teeth Inner Hole 5mm/0.19inch+ Closed Timing Belt 200mm/7.87inch Type B: 20 Teeth Inner Hole 5mm/0.19inch+60 Teeth Inner Hole 5mm/0.19inch+ Closed Timing Belt 280mm/11.02inch Type C: 20 Teeth Inner Hole 5mm/0.19inch+60 Teeth Inner Hole 5mm/0.19inch+ Closed Timing Belt 400mm/15.75inch Type D: 20 Teeth Inner Hole 5mm/0.19inch+60 Teeth Inner Hole 5mm/0.19inch+ Closed Timing Belt 610mm/24.02inch Type E: 20 Teeth Inner Hole 5mm/0.19inch+60 Teeth Inner Hole 8mm/0.31inch+ Closed Timing Belt 200mm/7.87inch Type F: 20 Teeth Inner Hole 5mm/0.19inch+60 Teeth Inner Hole 8mm/0.31inch+ Closed Timing Belt 280mm/11.02inch Type G: 20 Teeth Inner Hole 5mm/0.19inch+60 Teeth Inner Hole 8mm/0.31inch+ Closed Timing Belt 400mm/15.75inch Type H: 20 Teeth Inner Hole 5mm/0.19inch+60 Teeth Inner Hole 8mm/0.31inch+ Closed Timing Belt 610mm/24.02inch note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.