Single Grit Discs, 3/4" diameter, medium grit, package of 100 Yellow abrasive with press-on/ flip-off center hole feature. Exclusive grit and backing are designed for jewelry applications and provide exceptionally long life. Aluminum oxide grit in three grades, mounted on thin backing, provides outstanding results in sanding and smoothing operations. The flexible backing allows accessibility to hard-to-reach areas. Supplied in tubes of 100 discs.