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HMA-715 Engineered Plastic Bolt and Nut Sets are used with HM-677 Masonry Grout Windows for easy cleaning of debris and a clear view to inspect and monitor proper grout placement in masonry structures. The sets come with one engineered plastic bolt and nut which are used to affix the grout window to the block core. Once the grout is placed, twist and break off the exposed section of the plastic bolt to remove the acrylic window. Plastic nuts can be reused. Comes in a package of 20 sets.
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