Specification:Name: 2.5M 45 Degree Right Hand Helical GearMaterial: 45# SteelModel Number: 2.5 ModTooth Profile: Helical GearDirection: Right HandHelix Angle: 45°Teeth Number: 10 12 13 15 18 20 26 30 TeethTooth Surface Hardness: Hard Tooth SurfaceProcess Hole: 14/15/20mm (No keyway, no screw hole, need to activity via yourself)Features:1.High torque and coffee noise. Torque is 3 times increased than bevel gear.2.Strong and durable, solid put on resistance.Package :Packing : Plastic bag / Carton box.Quantity : According in your Choose!