This sale is for a very hard to find pair of Fuji GX680 80mm extension rails, boxed and in mint condition, suitable for use on all of the GX680 cameras.
This is an invaluable accessory for any Fuji GX680 camera user. These rails allow better than 1:1 macro images when used with a 100mm lens. They must be used in combination with the long bellows.
These rails are have no signs of use that I can see – probably unused. You will not find a better pair of rails. The instructions can of course be downloaded from this website.