The Diablo Diamond Grit Hole Saw/ Tile & Masonry Bits – 5/16" (8mm)is a precision-engineered cutting tool designed for drilling clean, accurate holes in hard materials like tile, stone, glass, and porcelain.his model features diamond grit edges for faster cuts and extended tool life, especially in brittle or dense surfaces. It includes integrated hole lubricant, which reduces friction and heat buildup during drilling, helping preserve both the bit and the material.