Surface Conditioning Disc For Die Grinder Surface Prep Strip Grind Polish Burr ?Value Kit?The 2 inch discs set comes with two 1/4'' holders, 15 non-woven discs (coarse/medium/fine), 64 aluminum oxide discs (40#/60#/80#/120#/180#/240#), 15 zirconium oxide discs (60#/80#/120#), two mini flap disc (40#), two black sanding discs and one wool disc. The product quantity and grits are indicated on separated packing bags. ?High Performance?These sanding discs combine premium quality sanding grains(aluminum oxide/zirconium oxide/non-woven aluminum oxide/SiC/wool) with strong, high toughness shank base, long last with high abrasive resistance. They can operate up to 23000 RPM. ?Wide Applications?Various surface conditioning discs are excellent for using on surfaces of carbon steel, stainless steel, alloys, iron, non-ferrous and other nonmetal materials like wood, glass, ceramics, stone. Wide used in shipbuilding, car building, aviation, and machinery. ?Easy to Install?These discs have unique safety torque screw, the connection between sanding disc and rubber holder get firm when rotating, ensuring steady working and no fall out. Just twist it to remove or connect, convenient and efficient. ?High compatibility?There are two 2-inch rubber backing pads in the set, which can be attached to any 1/4 inch power drill, air grinding tool, or die grinder. Great for most surface prep works like strip, burr removal, grind, polish, inverted circle and mirror and so on.