The DEWALT Extreme Metal Cut Off Saw Blade has an Extreme Diamond Edge made from metal cutting diamonds bonded to the wheel&lsquos surface using a proprietary technology. The disc is made from solid steel for reduced risk of breakage. The disc has no shelf life, unlike bonded abrasives this disc will not expire, as long as it is stored in proper conditions. For cutting a wide range of metals steel, stainless steel, cast iron, rebar, aluminium and non-ferrous metals. Ideal for use with the DCS690 FlexVolt XR Cut Off Saw. Specification Diameter 230mm Thickness 2.10mm Bore Size 22.23mm Max. rpm 6,650/min.