E. C. Moore's Mini Adalox Aluminum Oxide Snap-on Disc 3/8" Micro Fine Grit Pkg of 100. Moore's Brass Center Discs have been the industry standard since 1898. They snap-on and off quickly and easily, with no screws to drop or lose. Moore's discs can be used with the grit side in or out and won't come off with the reversal of the handpiece. The reddish-brown Adalox discs are less aggressive than emery and feature thin, resin-bonded, flexible paper.