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Snail gear - worm wheel allows you to increase or decrease the drive gear ratio for different applications. Snail gear metal – designed with craftsmanship for long-lasting performance. Snail gear with snail - a large gear ratio, when used with a gear gear, multiple gears must be used. Small Modulus Wormel - beautiful appearance durable material. Easy to install, portable. Brass snail wheel – designed with craftsmanship for long-lasting performance. › See more product details