Whirlwind USA CPC 4-Inch Laser Welded Premium Crack Chaser Tuck Point Blade for Concrete Asphalt (Factory Direct Sale) (4") Premium blades for routing of cracks in concrete and asphalt. Laser welded Segment height 10mm (.395) Arbor 7/8-Inch - 5/8-Inch. Size is 4"x.375"x.395"/10mm.