Featuring a high performance blend of zirconia alumina abrasives, BlueFire AVOS F826P coarse grit fiber locking see-thru discs last longer, cut 15% 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% 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. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.