Module: 2M 2.5M 3MTeeth: 20/25/30 teethBore: Process holeKeyway: No keywayRotating velocity ratio: 1:1Material: 45 # steelUses: Transmission partsFeatures:1. High quality 45 # metal material, high hardness, excessive strength, put on resistance, extensive bearing capacity, durable and durable.2. Overall blackening treatment, much less susceptible to rusting, high precision, comfortable operation, and occasional noise.3. Support customization, welcome to inquire.Buyers should read:1. It is necessary to machine the inner gap and solving method by means of oneself.2. 1 Set (including one left/right spiral bevel tools each)Kind tips:The colour of the picture is barely diverse from the real object, please take the particular object as the standard.You can check the precise length within the photo gallery, otherwise you can touch us for consultation.There is a slight error in handbook measurement, thanks in your understanding.There are assorted sizes, colors, supplies and types of merchandise within the store. If you have particular needs, please touch us.Package included: (according to your choice)