For use with 4-in thick glass block products. Provides a nominal 1/4-in mortar joint Made of non-corrosive material and will not rust or rot Used in mortar assembly methods to keep glass block aligned vertically and horizontally during installation Spacer remains embedded in the glass block mortar joint while the flat alignment tab twists off for professional looking results Sold as 25 piece bags Spacers are ready for installation and do not require assembly to be used Spacers may be modified for use along curbs and walls.
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