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Material: 45# steelStandard: GBModulus: 1 ModuleNumber of teeth: 90-150 TeethInner hole: Process HolePre-purchase Instructions:1. The surface has not been high-frequency quenching treatment2. Gears are inserted gears, there will be a slight eccentricity phenomenon, the gears have requirements for accuracy, please be careful to shoot or seek the advice of visitor service3. Involute gears, even though there's some deviation within the middle distance, can be correctly occluded, it's easier to get the correct enamel shape4. Gear materials is made of 45# steel, there may be rust stains in case of water, which is regular and won't impression standard use5. The bore is a drill hole (rough hole), the deviation is large, looking on the batchYou can discover extra merchandise in different material, type, color , sizes and shapes in our shop! If you have particular needs, please touch us, we are able to customise in step with your needs!Package includes: 1 piece * According for your choiceNotes:1.The color of the image is slightly different from the genuine object due to the digicam and light effect, please take the actual object because the standard.2.There is probably 0-0.3mm error for its thickness, 0-3mm error for its diameter / width / length in the handbook measurement, please take it into consideration, thank you!