Specification:Name: Spur Gear with StepModel: 2.5M (2.5 Module)Material: 45# SteelSurface Treatment: Teeth Hardening + Surface BlackeningNumber of Teeth: sixteen TeethTooth Height: 25mmTotal Height: 38mmFixing Screw: 2*M6Bore: 8 10 12mmKeyway Bore:10mm-keyway 4x1.8mm 12mm-keyway 4x1.8mm 14mm-keyway 5x2.3mm 15mm-keyway 5x2.3mm Shaft Hole: Machining CompletedTooth Surface Hardness: Hard Tooth SurfaceFeatures: 2.5 Module spur tools material is high-quality 45# steel, equipment surface excessive frequency blackening! Surface blackening can effectively avoid the phenomenon of rust, prevent oxidation.Note:1.The contour information described above (in addition to making sure the accuracy of the interior hole) may perhaps differ barely from batch to batch. No extra notice, please discuss with the particular subject!2.The product must be used with a rack of an identical modulus.Package :Packing : Plastic bag / Carton box.Quantity : According for your Choose!