This package carries (a)-(b). (a) 4 Pieces of 5 x. 250″ x 7/8″ Double Sandwich Tuck Point Diamond Blade For Concrete & Mortar Joint Removal non-threaded. Inner hole diameter 7/8″-5/8″. (b) 4 Pieces of 5 x. 250″ x 7/8″ (0.25 Thick) Tuck Point Diamond Blade For Concrete & Mortar Joint Removal non-threaded. Blade Diameter: 5 inch. Double blades in alternating position provide very fast mortar joints removal. Use for removal of damaged mortar concrete and masonry materials.