8 Pcs GT2 16T Bore 5mm Timing Pulley 5M Belt For RepRap Prusa Mendel 3D PrinterGT2 Pulley:Teeth number: 16Teeth pitch: 2mmDiameter of bore: 5mmFlange: DoubleTeeth width: 7.5mm (Very suitable and good for 6mm synchronous belt)Screw: M3Material: AluminiumGT2 Belt:Pitch: 2mmWidth: 6mmMaterial: Fiber Reinforced RubberLength: 5MFeatures:Please note, this is 5mm bore pulley.These pulleys can be used in Ultimaker, Ditto or other 3D Pinter designs with similar kinematics.One Aluminum GT2 Pulley and one Allen key.Please see the drawing for dimensions and calculated steps per mm, for your 3D printer firmware parameters.For 3D Printing applications, GT2 2mm belt system works better than T5, T2.5, it gives better smoothness and accuracy of positioning, resulting in better printing qualityPackage includes:1 x GT2 Belt  8 x GT2 Pulley16 x Screws1 x Wrench (As Pictures)