1) Undercut Protection segments provide longer lifetime when cutting Abrasive Materials. 2) Fits to Petrol Cutters, Bench & Floor Saw Machines. 3) Different Cutting slot have different function, narrow U or key slot give a wider segment and longer lifetime. 4) Dry or wet cutting reinforced concrete, aggregate concrete, hot rolled asphalt, asphalt, asphalt over concrete&green concete.