The gears here are for Nikon lenses that are not part of the Turtle line because of special features or the size of the lens.
All components are constructed of impact resistant ABS plastic and color coded to help you combine components easily. Each component is clearly marked to assist you to assemble the components onto your lenses and with each other.
Refer to Xit 404's Chart of Verified Housings to determine if your particular housing and lens combinations are supported. Xit 404 continues to add new lenses to its line of gears. If you do not see your lens/housing on the list contact us - it may be coming.