Non-Conductive Nylon Knot Wall Plug Four-Wing Expansion Anchor for Cable Tray Hollow Wall Installation Product Description The M6 x 55mm Nylon Four-Wing Knot Expansion Wall Plug is a non-conductive plastic fastening solution engineered for cable trays, electrical conduits, and junction box mounting on hollow wall and cavity wall surfaces. The anchor features an electrically insulating PA6 nylon body, making it the safe choice for installations near electrical wiring where