The Edge Flap Disc is ideal for finishing fillet welds in tight places. The premium zirconium oxide grit sandpaper creates a smooth consistent finish and is able to grind on the bottom, top, and edge of the disc. The edge is particularly useful in getting into tight spaces and sanding small areas without damaging adjacent material. The wheel shape is type 29 which has a slight angle/conical shape which is better for aggressive grinding, shaping, and contouring of surfaces. This style of disc is best used at a 15° to 25° angle.