Made of Metal and resin bond formed under high temperature and high pressure.Three color band stand for different grits as 320#, 180# and 80# from inside to outside.It's use as position 3 on shape machine. It makes perfect fine grinding result after roughrinding by diamond wheel.It's to take the place of Shape Bevelling Resin wheel. Dimension: 150mm Bore: 12mm or 22mm Diamond layer: 15*10mm Base: Aluminium or Plastic Observating hole: 3 pcs on aluminium base and 6 pcs on plastic base