Precision Adjustable Plastic Furring Channel Leveling Anchor Fine Tuning Nylon Expansion Bolt for Ceiling Calibration Product Description The Precision Adjustable Plastic Furring Channel Leveling Anchor is a specialized nylon expansion bolt engineered for laser-aligned ceiling suspension systems, clean room ceiling grids, and architectural furring channel installations requiring millimeter-level height calibration. The anchor features a unique graduated depth scale on the