The Jumbo Spanner is replacement item specific to the Jumbo MK2, MK3 and Hyperstat range. It is used in a pair to adjust the nuts of the guide shaft. Using two spanners in counter rotation to eachother will lock or unlock their joint position at a height along the thread, ultimately stopping the stamper from lowering further than the required height for the concrete unit being produced. The price is per spanner, two of which are functionally needed. It is not a wear and tear item and is typically replaced due to theft or loss.