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Buyer's must-read1.Worm gear and worm are offered separately, if you would like to use together, you must picture separately.2.The modulus represents the model, and the computer virus gear and trojan horse can only be used collectively under an identical modulus.3Worm tools for nylon material, floor some burrs is normal, intellect to not buy.Nylon bug tools /wormFactory direct sales, total specificationsWorm gear and bug are sold separatelyWorm equipment and worm have an identical modulus to matchWorm gear-Circular holeWorm gear-Keyseat holeWorm -Circular holeWorm -Keyseat holeProduct informationBrand:BEI LI GAOName:Worm gear and wormWorm gear:Blue nylonWorm:Stainless steel/Carbon steelModel quantity :0.5M/1M/1.5MDirection:DextrorotationWorm equipment typeunit:mmThe number of enamel in a equipment represents the speed ratio.Case:20 teeth computer virus gear,The speed ratio is 1:20Module:1M15T worm gearDistance between centers:15.5Speed ratio:1:15Optional internal holeΦ3/Inner bore6+Φ2/M4Φ3/Inner bore8+Φ2/M4Module:1M20T malicious program gearDistance between centers:18Speed ratio:1:20Optional inner holeΦ3/Inner bore6+Φ2/M4Φ3/Inner bore8+Φ2/M4Φ3/Inner bore10+Φ2/M4Φ3/Inner bore12+Φ2/M4Module:1M25T worm gearDistance between centers:20.5Speed ratio:1:25Optional inner holeΦ3/Inner bore6+Φ2/M4Φ3/Inner bore8+Φ2/M4Φ3/Inner bore10+Φ2/M4Φ3/Inner bore12+Φ2/M4Module:1M30T malicious program gearDistance between centers:23Speed ratio:1:30Optional inner holeΦ3/Inner bore6+Φ2/M4Φ3/Inner bore8+Φ2/M4Φ3/Inner bore10+Φ2/M4Φ3/Inner bore12+Φ2/M4Module:1M35T worm gearDistance between centers:25.5Speed ratio:1:35Optional inside holeΦ3/Inner bore6+Φ2/M4Φ3/Inner bore8+Φ2/M4Φ3/Inner bore10+Φ2/M4Φ3/Inner bore12+Φ2/M4Module:1M40T computer virus gearDistance between centers:28Speed ratio:1:40Optional inside holeΦ3/Inner bore6+Φ2/M4Φ3/Inner bore8+Φ2/M4Φ3/Inner bore10+Φ2/M4Φ3/Inner bore12+Φ2/M4Module:1M50T trojan horse gearDistance between centers:33Speed ratio:1:50Optional inside holeΦ3/Inner bore8+Φ2/M4Φ3/Inner bore10+Φ2/M4Φ3/Inner bore12+Φ2/M4Module:1M60T malicious program gearDistance between centers:38Speed ratio:1:60Optional internal holeΦ3/Inner bore8+Φ2/M4Φ3/Inner bore10+Φ2/M4Φ3/Inner bore12+Φ2/M4Module:1M80T bug gearDistance between centers:48Speed ratio:1:80Optional inside holeΦ3/Inner bore8+Φ2/M4Φ3/Inner bore10+Φ2/M4Φ3/Inner bore12+Φ2/M4Physical shootingStainless metal /B malicious program + Nylon bug gearPhysical shootingStainless metallic /A bug + Nylon malicious program gearPhysical shootingCarbon metallic /B trojan horse + Nylon trojan horse gear