pLACKMOND Diamond TwinBlade, Laser Weld Segmented Wafer Style, Series PRM Series, 4 in Diameter Blade, 58 to 78 in ArborShank, 14 in Cutting Width, DryWet Cutting Condition, 10 mm Segment Height, 14 in Kerf, 15000 rpm Maximum, Applicable Materials Brick, Mortar, Masonry and StoneppThe PRM Series twin and tri blade tuck point blades are designed to grind out and repair mortar joints in stone or brick masonry walls They are comprised of two or three thin kerf segmented diamond blades welded together at the arbor point, with a clear channel between each blade, which provides increased cutting speed versus traditional, solid style tuck point bladesp