7640 Imer General Purpose Diamond Blade by Imer General Purpose Diamond Blade All type of equipment, wet or dry cutting Concrete, masonry & stone. Choose from 14″ or 20″ 14″ blade has a 1″ / 20 mm arbor. 20″ blade has a 1″ arbor. . Posted in Concrete & Masonry Tools, Diamond Blades, Masonry Diamond Blades