Whirlwind USA KPA 5-Inch Laser Welded Premium Active Tuck Point Blade for Concrete Mortar (Factory Direct Sale) (5") Wild gullet, solid segmented 'boulette' style blades for extremely fast cutting/grinding of mortar and concrete. Laser welded Segment height 12mm (.475) High number of segments deliver more aggressive action. Arbor 7/8-Inch - 5/8-Inch. Size is 5"x.250"x.475"/12mm.