The cleaning disc is supported by a fibreglass carrier plate. The N377 Best for Metal Cleaning Disc delivers fast cleaning results on metal and masonry surfaces. It features a 3D open-structured fleece, enabling rapid material removal rates without clogging. Furthermore, the 3D fleece is coated in silicon carbide which renews its entire structure and creates sharp cutting edges: for efficient and consistent material extraction. It is intended for removing rust, paint and oxide layers off metal as well as lime deposits, moss and graffiti from stone, marble and concrete.