Bon 11-292 6-Inch to 8-Inch Cast Aluminum Line Stretchers, 1-Pair Go to amazon.com Related posts The 18 best masonry tools for 2022 FeatureCast aluminum6-Inch to 8-InchSold in pairsAlways wear eye protection DescriptionStretches mason's line between blocks. Available in a number of sizes. Made from cast aluminum for increased durability.