Suitable For ( use of polishing flap disc) Grinding and finishing of welds Deburring, rust removal and snagging Suitable for most ferrous & non-ferrous materials Excellent for surface finishing Abrasive Grains of polishing flap disc A/ O - Aluminium oxide coated, for alloy steel and low-alloy steel Z/ A - Zirconia Alumina coated, for high-alloy, stainless, and heat-treated steel; high-tensile, non ferrous metals S/ C - Silicon Carbidecoated, for marble, stone, glass, and non ferrous metals Type for polishing flap disc: T-27 – Flat shape, Used for grinding flat surfaces. Most efficient when used at a 0-15 degree angle T-29 – Conical or Tapered shape, most used for contour and edge grinding. Best at 15 - 25 degrees angle.