5 pack - 3" x 21" Polyester Backed Aluminum Oxide Belts (Best for: Wet Applications)Best for wet applications Can also be used for more aggressive sanding Y weight polyester backing Wet & Dry applications Choosing a Grit Coarse Grits (24 80): For heavy material removal, weld grinding, or shaping. Medium Grits (100 180): For blending, deburring, and intermediate smoothing. Fine Grits (240 400): For finishing or preparing for polishing. Super Fine (800 1200): For mirror polishing or fine detailing. Choosing a Backing Weight J Weight if

·         Y-Weight for tough grinding and heavy material removal on hard metals and flat surfaces

· J-Weight if you need flexibility for finishing

·         Course (Brown) is equivalent to 60-80 grit

·         Can be used on ferrous metals like stainless steel when looking for a cheaper option

** Still unsure

o   Initial blending of welds or seams

o   Light surface cleaning

o   Pre-polishing metal surfaces

·         Can also be used on some non-ferrous metals

· Can also be used as a cheaper option for general metal sanding

o   Removing deep scratches

·         Our premium ceramic material has an 80% ceramic/20% alumina blend with grinding aid