Parkson Worm gear testing machines model 350 machine can be inspected in our shop under power Max diameter worm gear 10" max center distance 5" Max worm diameter swing 4" Max worm length 4" Machine is equipped as photographed contact us today to learn more about this machine and receive formal quote on line visit our website for this machine and others at WWW.Pisellient.com for a formal quote and pricing or email Rich at Rich@Pisellient.com thank you