For those dealing with concrete cracks, our foam rods offer an effective solution. These foam backer rods can be inserted into to provide a stable base for crack fillers. Clean thoroughly, insert the foam rod, and then apply the concrete filler over it. This technique ensures the filler stays in place and provides a repair, preventing further damage. Features -Color:Black -Material:Foam -Size:200.00X4.00X4.00cm/78.60X1.57X1.57in -Durable construction: constructed from solid foam, this backer rod is built to withstand various environmental conditions, ensuring reliable performance over time -Versatile use: ideal for filling gaps in a wide range of applications, including expansion joints, wood cracks, wall cracks, and door and window seams -Effective protection: provides a secure seal that prevents moisture, dirt from entering gaps, thereby protecting the structural integrity of the area -Easy installation: simple to push into gaps and can be easily cut to the desired length, making it convenient for both professional contractors and diy users -Comprehensive solution: designed to meet diverse caulking needs, this foam backer rod is a versatile and essential tool for various home improvement and construction projects Package list: 1 x foam rod