STI Terrazzo Pads are best for wet polishing on epoxy- and portland-based terrazzo and stone - use as a closing step & first step of restoration. Also, can be used as a first cut tool on new, unsealed concrete. STI Terrazzo Pads have a specialized matrix for aggressive cut with a fine scratch pattern. The 3-inch pad contains no center hole which cancels the collection of debris & spent diamonds. 3” diameter: 8 mm thickness. For new and improved Terrazzo pads by STI, see the Terrazzo+ Pads!!