This is a replacement top for a swede. This is the levelling, extension that raises out of the top.
Replacement Top Extension
SKU: 364115376135191
$45.99Price
A set of swedes is used for a quick assessment of the grade of a road, hill, etc. Just set them to the desired height and look across them to see if they are level. if it is, then your grade is correct. This however, is just a replacement piece.