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Model: 1.5 module worm gear Drive Ratio: 1:20/30/40 Speed ratio: 1:20/1:30/1:40 Exquisite in workmanship, high in strength and toughness. Full and tight engagement of the teeth, excellent power transmission capacity. › See more product details; Product description Model: 1.5 module worm gear Drive Ratio: 1:20/30/40 Speed ratio: 1:20/1:30/1:40; Product description Model: 1.5 module worm gear Drive Ratio: 1:20/30/40 Speed ratio: 1:20/1:30/1:40; Model: 1.5 module worm gear Drive Ratio: 1:20/30/40 Speed ratio: 1:20/1:30/1:40