6 ½" diamond blade for the Crain No. 812 Super Saw, No. 820 Heavy-Duty Undercut Saw, or No. 825 Heavy Duty Undercut Saw. This dry-cutting segmented diamond blade is abrasive cutting and provides superior blade life undercutting masonry, ceramic tile, or stone. Not for use on any metal or wood materials. For Next day and 2nd Day FedEx fast shipping visit Crain 822 Diamond Undercut Blade or Crain 822 6 1/2" Diamond Undercut Blade.