E. C. Moore's Sand Snap-on Disc 7/8" Medium Grit Pkg of 200. Brand: Moore's Material: Silicon Carbide Quantity: Pack of 200 Used For: Pre-Polishing, Semi-Finishing, & Blending About this Item: 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.