Constant contact with material delivers a smoother finish than segmented blades</br>For General Purpose</br>Great for Cured Concrete?? Block?? and Brick</br>Arbor:  5/8"20mm?? 7/8"/br>Optimum bond matrix provides a Faster?? Longer?? Smoother Cut</br></br>Product Description</br></br>Makita A-94546 Specifications:Arbor: 5/8"20mm?? 7/8"Diameter: 4"Makita A-94546 Features:Great for cured concrete?? block?? and brick Constant contact with material delivers a smoother finish than segmented blades Optimum bond matrix provides a faster?? longer?? smoother cut</br><br/>http://www.amazon.com/gp/product/B000MQQ81Wnnce.