20T GT2 Aluminium Timing Pulley 2GT 5M Belt For RepRap Prusa Mendel 3D PrinterGT2 Pulley: Teeth witch: 2mmTeeth number: 20Groove width: 6mmTeeth width: 7mm (Very Suitable and good for 6mm synchronous belt)Diameter of bore: 8mmFlange: DoubleMaterial: AluminiumSetscrews: M4GT2 Belt:Pitch: 2mmWidth: 6mmLength: 5MMaterial: Fiber Reinforced RubberPackage includes:1 x GT2 Belt8 x GT2 Pulley16 x Screws1 x Wrench(As Pictures)