MK Diamond 159404PK20 MK-99TWD is a 20-pack of 4.5-Inch and Turbo Rim Wet/Dry Cutting Blades for Concrete and Brick, 7/8-Inch 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.