GT2 20 Teeth Aluminium Timing Pulley 2.5M 2GT Belt For 3D Printer RepRapSpecification:GT2 Pulley:Teeth: 20Groove width: 5mmTotal width: 15mmDiameter of bore: 5mmFlange: DualMaterial: AluminiumGT2 Belt:Pitch: GT2Width: 6mmLength: 2.5MIdler:Teeth: 20Diameter of bore: 5mmTotal width: 8mmMaterial: AluminiumFeature:Durable and practicalDesigned specifically for linear motionGT2 Pulley and GT2 Belt are used together、 very convenient to useRound tooth profile guarantees that the belt tooth fits smoothly20 Teeth contact with the belt、 that minimizes the chance of the belt slippingPackage includes:1 x GT2 Belt  2 x GT2 Pulley2 x Idler4 x Tensioner4 x Screws1 x Wrench (As Pictures)