This part is a Kubara Lamina diamond blade, part number D42-40-04-R0. It is a wet blade that has a turbo core design and is primarily used for cutting granite, marble, and engineered stone. It also works well with concrete and other masonry materials. The blade has a 4" diameter and 0.045" segment height, with 40 segments on its double-sided, segmented turbo core. The overall thickness of the blade is 0.086", and it is designed for use with a 5/8"-11 thread arbor. Due to its turbo core design, this blade has superior cooling capabilities, which helps to reduce friction and extend its lifespan.