... for 5pcs, 1ct for 7pcs, 1ct for 8pcs, 1ct for 9pcs, 1ct for 12 pcs, 1ct for ... 17pcs etc. Grade: YWD 25, YWD 30, YWD 50, YWD 70 for ... make tools for sawing all kinds ... also suitable for geological drills. ... thermal stability, suitable for high grade cutting, ... high strength, suitable for circular saws, frame ... crystal, suitalbe for grinding and free ...