The Milwaukee Diamond Max™ Hole Saw with a 5/16 inch (8mm) diameter, 1/4 inch quick-change hex shank is designed for wet cutting through tough materials like porcelain tile, stone, and glass. Higher grade diamonds for maximum heat and fracture resistance. Improved braze for superior diamond retention and a large slug ejection slot for easy plug removal. It is designed to be used with water to keep the bit cool and reduce chipping. This hole saw is ideal for projects involving hard, abrasive materials and provides clean, efficient cuts.