ALUMINIUM OXIDE FLAT WHEEL(ABRS-0014) 1.BROWN GRID BACK 2 ... 400# 3.High quality with low price. ALUMINIUM OXIDE FLAT WHEEL(ABRS-0014)BROWN GRID BACK Abrasive Grain Sizes: ... , putty, glass and metal polishing and grinding.4 can be used for shipbuilding, automotive, aviation, machinery, instruments, furniture, bridges ... surface rust, paint, deburring, grinding welds. ALUMINIUM OXIDE FLAT WHEEL(ABRS-0014)