Universal Multi Substrate Plastic Furring Channel Leveling Anchor Nylon Expansion Bolt for Concrete Brick Block Mounting Product Description The Universal Multi-Substrate Plastic Furring Channel Leveling Anchor is designed for renovation and mixed-construction furring channel projects where installers encounter multiple substrate types — concrete, solid brick, aerated concrete block, and natural stone — within the same job site. The nylon PA6 anchor body features an enhanced