This item has been tested and functions well, but has a slightly stiffer helical adjustment near the maximum extension. There are numerous signs of wear, including some loss of paint and one small dent. It does function but is being sold at a reduced price because of the wear. Bargain! No caps are included, but it will be packed well.
This is a cool macro accessory that mounts firmly to the camera body and works as a variable extension tube by turning the outside like a focus ring. It has a helical extension unit it it that makes an effective range from 22mm up to 68mm. Note that not all lenses will work throughout the whole range - particularly the lenses with fat barrels, but all lenses will work at the maximum extension. I find it particularly well suited with the 80mm Xenotar, 120mm macro, and 150mm lenses. It will work with the 90mm macro, but not through the whole range.