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Aluminum material, high strength and corrosion resistance, can be used for a long timeThe inner diameter is 15mm, which is a common size for sewing machines. Size outer diameter 45mm-80mm are solid, size 85mm-115mm are hollow.High transmission efficiency, cushioning and shock absorption capabilities, low noiseMotor Belt Pulley is applicable to all kinds of industrial sewing machine clutch motor use.The outer diameter of the pulley is your chosen size. The smaller the diameter, the slower the rotation speed of the motor.Size - 50mm Outer Diameter. The inner diameter is 15mm, which is a common size for sewing machines. Size outer diameter 45mm-80mm are solid, size 85mm-120mm are hollow.Material - Industrial sewing machine transfer wheel is made of aluminum material, high strength and corrosion resistance, can be used for a long time.Features - High transmission efficiency, cushioning and shock absorption capabilities, low noiseApplications - Motor Belt Pulley is applicable to all kinds of industrial sewing machine clutch motor use.Notice - The outer diameter of the pulley is your chosen size. The smaller the diameter, the slower the rotation speed of the motor.