Brazing is a commonly used technology in producing diamond discs , the segment is bonded tightly to the steel base by brazing under high-frequency electrical current . it features fine quality and attractive price . and is an excellent substitution of laser welded cutting discs. We produce following size: Diameter center hole segmented Of out number 4" 5/8" 4/5" 7/8" 8 4.3" 5/8" 4/5" 7/8" 9 4.5" 4/5" 7/8" 8 5" 4/5" 7/8" 9 6" 4/5" 7/8" 12 7" 7/8" 1" 1 1/5" 14 8" 7/8" 1" 1 1/5" 14 9" 7/8" 1" 1 1/5 18