AMERICAN TOOL GROUP 4 1/2" DIAMOND DRY BLADE (2PK) BUNDLE NO. 11442 This American Tool Group bundle includes two 4-1/2 inch diameter diamond saw blades, model DRY ROUND BLADE, suitable for cutting through cement, concrete, and other multi-purpose materials. The blades are designed for use with wet or dry conditions and are ideal for cutting tiles, marble, and brick. With a maximum speed of 13300 R.P.M, these diamond saw blades are a reliable and efficient choice for any general cutting task. The California Prop 65 Warning applies to the brass components of this product, as they contain lead, a chemical known to cause birth defects and other reproductive harm. Order now and enjoy the convenience of having high-quality diamond blades on hand for all your cutting needs.