Mercer Abrasives Standard T27 Aluminum Oxide Flap Discs feature high quality aluminum grains that require flat grinding surfaces. These standard aluminum flap discs are ideal for general purpose sanding and grinding that does not require extensive material removal. Standard T27 aluminum flap discs are ideal for applications such as rust removal and light deburring on all ferrous and non-ferrous metals. Try these type 27 standard aluminum flap discs today!