The Original Adjustable Line Stretcher (Pair)

Stretch mason's line between course blocks for straight walls. Sturdy, lightweight aluminum line stretchers work on various size blocks from 4" to 12". Change the size by moving the wing nut to appropriate hole. Sold as a pair.
 
Create a straight course in masonry
Work on various size blocks from 4" - 12"
A wingnut makes it easy to change size
Strong aluminum construction