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Specifications: Tooth width: 7.5MM Inner: 5MM Two M4 keyhole 90 distribution Outside diameter: 16MM Tooth number: 20 Tooth pitch: 2mm Hole diameter: 5mm Flange: double Material: Aluminum Application: For CR-10 3D printer Package included: 1x Creality 3D 2GT-20 Teeth Timing Pulley