Clear Storage Jar Included – Conveniently store America’s best surface prep cookies in the clear storage cookie jar, so you can always see how many you have remaining in the 50-pack Coarse Grit – Use the coarse grit non-woven disc wet or dry for tasks like final cleaning, deburring and finishing when attached to a die grinder or right angle grinder Made in the United States – Professionals can count on these discs, which are manufactured in America Quick-Change Locking Device – The Type R quick-change locking back simplifies swapping out a used disc for a fresh one Compatible Design – These Star-Brite finishing discs offer compatibility with nearly all brands of twist-locking styles