diamond disc: diamond coated disc for lab,for divide,separate,fabricate,contour,shape of dental restorative materials. Figure style for e series:Edge coated / full coatedEdge thickness: 0.20mm, flat disc very thin 0.3mm, flat disc thinDia. general size:19mm / 22mm / 24mm / Big size: 30mm / 35mm / 40mm Mini size: 16mm / 13mmShape: wheel shapeRecemmended maximum speed:20,000rpmquality:0.2mm, flat ...