? Fiber Locking See-Thru Disc,Fiber Discs ? Featuring a high-performance blend of zirconia alumina abrasives, BlueFire AVOS F826P coarse grit fiber locking see-thru discs last longer, cut 15 percent faster and draw less power than standard zirconia discs. An excellent choice for coarse grit, fiber disc work, these discs cut aggressively and with up to 30 percent less heat for extended disc life. Engineered with the patented AVOS (Allows View of Surface) hole design, these see-thru discs make work at hand easier to see, while the Speed-Lok arbor mount makes it quick and easy to change discs without tools. ? High-performance zirconia alumina abrasive blend provides 15% faster cut and longer life with less power draw than conventional zirconia discs ? Heavier fiber backing for additional strength and tear resistance ? Advanced resin bond technology with enhanced grain adhesion extends life ? Better coarse grit fiber disc choice combined with AVOS patented hole design for surface view gives an aggressive cut, and reduces heat by up to 30 percent for longer disc life; Speed-Lok arbor mount provides fast, easy, tool-free disc changes ? Coarse/50 grit for stock removal and blending