Garryson Quality 115mm 41/2 inch Sanding Flap Discs (10 pack) - For use with 4 1/2'' (115mm) angle grinders and sanders when removing rust, grinding of welds, parting lines on casting and carbon steels or removing rough edges on most surfaces. The high grain adhesion is for a long life which outlasts conventional sanding discs by up to 25 times, with these flap discs there is no backing disc required, it fits directly onto an angle grinder and with different grits of discs you'll be able to finish your job a lot quicker than any conventional method.