2 pack - 4" x 132" 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

·         Depending on the coarseness of the belt you choose

plastics & composites

·         Our cork belts are 100% cork and have no “grit” to them

What Backing Weight Should I Use

· Best for wood sanding

Choosing a Grit

· Y-weight polyester backing

· Can also be used for more aggressive sanding

o   Smoothing welds and seams

·         Super Fine (800-1200): For mirror polishing or fine detailing

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

·         Y-weight polyester backing