Features 【Quality Material】Adopt high quality aluminum, excellently machined, finished smoothly. 【Accessory Parameters】This pulley is for 6mm width 2GT timing . 2pcs M3 keyhole placed in 90 degree angle. 【Bearings】Each of the two sides of the wheels were mounted bearings. 【Perfect For】Perfect choice for building a 3D printer or similar projects. 【Guarantee】If you have any questions about the product, please email us, we will reply you and solve your questions within 24 hours. Description: This synchronous aluminum pulley is designed for 3D printer. It is an 3D printer accessory for 6mm wide with 20 teeth. As an synchronous pulley wheel, you will find it perfect for 3D printer or similar projects. Specifications : Material: Aluminum Alloy Height: 16mm / 0.629" Outer Diameter: 16mm / 0.629" Inner Diameter: 8mm / 0.314" Width: 6mm / 0.236" Quantity: 2 Weight: 10g(approx.) Package Includes: 2 x Pulleys Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Package List