Lens Focus Motor.This lens focus motor is perfect for your DIY projects. Using a standard stepper motor with a 20:1 Worm drive this lens motor is easy to implement for all your projects. The 15mm clamp can be adjusted up and down to ensure a fit with any lens. The industry standard .8mod gear is made from non-infused nylon for a lifetime of wear free gear mating. Stepper Motor driven Zero mark for indexing. Durable Design Carbon Fiber infused Nylon construction body Non infused Nylon Gear 20:1 Worm Drive Adjustable 15mm clamp Comes with a 4 pin connector Compatible with any stepper motor based motion control system. Perfect with the df8X Motion controller. Please not that all systems are built to order, please allow up to a week for shipping. Free shipping within the USInternational please contact us for shipping rates.