... , 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0-4.0mm Weight: 1ct for 5pcs, 1ct for 7pcs, 1ct for ... and thermal stability, suitable for high grade cutting, drilling, and grinding tools. YWD 2160 complete crystal shape with full surface, good ... middle grade, containing more regular crystal, suitalbe for grinding and free-cutting tools, grinding wheels which work with medium load. synthetic diamond for ...