Aluminum oxide flap disc is used for grinding and polishing of metal, non-ferrous metal, wooden, iron, cast iron, and sanding weld joint. The disc with T27 and T29 two types. T27 type flat faced discs are better on flat surfaces and will produce a more consistent finish. T29 type includes a built-in angle to assist with grinding complex work surfaces, seams and inside corners. We still have other kinds of abrasive flap disc for your choice： Zirconia alumina flap disc Calcined alumina oxide flap disc Ceramic flap disc Silicon carbide flap disc
