MK Diamond 159106PK20 MK-99TWD is a 20-pack of 4-Inch Turbo Rim Wet/Dry Cutting Blades for Concrete and Brick, 20mm to 5/8-Inch Arbor. The continuous Rim is designed for Faster Cutting with Minimal Chipping, Cutting Brick, Block, Paver, Concrete, Tile, Roof Tile, Stucco & Cement Siding.