The bolt on scriber acetol base is 6mm thick and fits on the scriber bases which have holes for the profile attachment.
It protects surfaces which might be marked by the aluminium base but can easily be removed when not needed.
Included with the base cover are 2 x 8mm countersink m4 bolts, 2 x m4 nuts and 2 x washers.
The narrow version fits the skinny boy, the wider version fits all the other scribers in the range.