Quality assurance: If you encounter any quality issues, please contact us promptly and we will do our best to provide assistance. Zeberoxyz 2PCS Set GT2 Synchronous Wheel 20&40 Teeth 5mm 6mm Belt Zeberoxyz 2PCS Set GT2 Synchronous Wheel 20&36 Teeth 5mm Bore Aluminum Timing Pulley With 2pcs Length 200mm Width 20 36t 5b 6 Aluminum Synchronous Wheel Key Features · [Material] Aluminum Alloy, Surface oxidation treatment · [Widely Used]Widely used for milling machine, gear shaper, drilling machine, hobbing... Aluminum material: The SHCEEC timing belt pulley is made of high-quality aluminum, which is reliable and durable. Package includes 2 x 40 teeth 2GT synchronous pulleys, 2 x 2GT 20 teeth synchronous pulleys, 2 x 200mm long and 6mm wide belts, 4 x M4 screws and 1 x Allen key Package Including: 2 x 5mm bore 40 tooth synchronous wheels 2 x 5mm bore 20 tooth synchronous wheels 2 x length 200mm width 6mm belts 4 x screws 1 x allen wrench