The MasonMate Hollow Wall Anchors provide a permanent threaded fixing in a hollow wall. Zinc Plated for increased durability.Select Option M4 x 20mm (100)M4 x 32mm (100)M4 x 38mm (100)M4 x 46mm (100)M5 x 37mm (100)M5 x 65mm (100)M6 x 52mm (50)M6 x 65mm (50) Add to Basket Quantity