Features: 1. Made of aluminum material, durable and long service life. 2. Hole diameter 28mm, 5-level outer diameter: 54mm, 76mm, 102mm, 128mm, 150mm. 5-slot design suitable for different speed ratio requirements. 3. V-type 5-speed motor shaft drive pulley compatible with various machine types, adaptable to different speed requirements. 4. Suitable for A-type V-belts and timing belts. A-type pulley offers cushioning, strong damping ability, and low noise operation. Installation method: 1. After receiving the pulley, heat the pulley evenly for approximately 2 minutes to facilitate installation. 2. Align the keyway of the pulley with the motor shaft. 3. Use a damping block when securing the pulley to avoid damage. Specifications: Material: Aluminum Color: Silver Hole Diameter: 28mm Height: 82mm Outer Diameter: 54mm, 76mm, 102mm, 128mm, 150mm Dimensions: 15 x 8.2cm (5.9 x 3.23 inches) (Diameter x Height) Weight: 576g Package includes: 1 x Five Step Belt Pulley