hot pressing special for building materials and so on saw bladehot pressed --- long lifedesigned for hand held circulai saws and most abgle grinders.Provide fast ,free, smooth cutting in tile ,brick blocks ,concrete,marble,soft granite,stone and many other materials.Inches Metric(MM) Arbor Size Segmened Dimension 4.5 115 20/22.23 7 9 230 22.23/25.4 7