Assemble your own glass block windows at home. Eliminate the need to use mortar, no masonry experience required. This method requires less materials then the standard mortar installation. Quicker and easier than ever before.


Installs vertically between Imperial 3″ Thinline glass block to create smaller, even joints when using a silicone application method. Designed to create an “all glass” look and allow more light to come through.


Not for use in constructing curved glass block walls.


Sold in packs of 10. Each measures 7.5″ in length.


Made in the USA.