What Materials Can Crete-Flex SS4 Fasteners Be Installed Into? They can be installed into concrete, masonry, brick, block, stone, and mortar joints when the correct pilot hole and embedment depth are used. By Marsh Fasteners|2026-06-29T04:37:18-04:00June 29, 2026|Crete-Flex SS4 Masonry Fasteners|