Quartz Lumps Grade A – Superior Quality Grade A – Medium Quality Grade B Quartz Grit - In sizes of 0.1 mm – 0.6 mm 0.6 mm – 1.2mm 1.2 mm – 2.5 mm 2.5 mm – 4mm 4 mm – 6 mm 6 mm – 10 mm Based on customer requirements, we can customize the product sizes. We use Grade A – Superior and Grade A – Medium quality for grit making.