2" x 72" Sanding Belts for Finishing & Sharpening, 3 PACK

2" x 72" Sanding Belts for Finishing & Sharpening What is Finishing & Sharpening? Profiling is the development of the basic shape of a cutting instrument. Sharpening involves giving an edge to the profiled piece of steel/metal that was previously profiled and shaped.  What does an X or J weight mean? Abrasives are adhered to a backing material. That backing material's thickness (related to its flexibility) is categorized by the alphabet. Backings closer or rated as 'A' are substantially more flexible than the stiffest 'Y' weight backing you'll find on our site. Backings with an 'A', 'B', 'C', 'D', 'E', or 'F' backing are all considered paper backings. 'E' and 'F' weight backings are typically used to make belts as they are the most durable paper backings available (typically found in the wood industry) though still much less durable/thick than the full or partial synthetic backings like an 'X' or 'Y' weight. Typically various 'X' and 'Y' weight backings are used in metal work