... -P400 Size: 100mm,115mm,125mm,150mm,178mm, Material: Aluminum oxide Flexible grinding disc,radial flap disc Diameter X Hole sizeGrit No ... )Aluminium oxide, (A.O.)Suitable for iron, mid steel, welding rods, cost iron aluminium, non-ferrous metals and wood.2)Silicon ... metal iron and/or iron compounds.Exhibition booth:Production line: Flexible grinding disc,radial flap disc