Grinding wheel

A grinding wheel, comprising:

• a grinder, substantially in a circular disc shape, for grinding or polishing a surface of an object, and having a center hole penetrating through the grinder and located radially through the center of the grinder, and a plurality of fixing holes penetrating between the center hole and the periphery of the grinder;
• a front cover, installed on a first side of the grinder, and having a first surface and a second surface, and the first surface being attached closely to the grinder, and a first center rod being disposed perpendicularly at the center of the first surface, and a first penetrating hole being disposed axially through the first center rod, and a plurality of first fixed rods being disposed radially around the first center rod, and wherein each first fixed rod has a second penetrating hole disposed axially therethrough, and a first rough portion being disposed between adjacent first fixed rods, and a first circular groove concavely disposed at the first penetrating hole of the second surface, and a second circular groove being disposed concavely at each of the second penetrating holes of the second surface;
• a rear cover, installed on a second side of the grinder opposite of the front cover, and having a third surface and a fourth surface, and the third surface being attached closely to the grinder, and a second center rod being disposed perpendicularly at the center of the third surface, and a third penetrating hole being disposed axially through the second center rod, and a hexagonal section being disposed axially in the third penetrating hole, and a plurality of second fixed rods being disposed radially around the second center rod wherein each second fixed rod has, and a fourth penetrating hole disposed axially therethrough, and a second rough portion being disposed between adjacent second fixed rods, and a third circular groove being disposed at the third penetrating hole of the fourth surface, and a hexagonal slot being disposed at the fourth each of penetrating holes of the fourth surface;
• wherein the grinding wheel is engaged between the front cover and the rear cover such that the first center rod engages the second center rod through the center hole and the first fixed rods respectively abut the second fixed rods through the fixing holes;
• and
• a plurality of bolts, one bolt passing through each of the second penetrating holes into the fourth penetrating holes for securing a nut and for clamping the front cover to the rear cover.