Uxcell Diamond Drill Bit Tile Glass Hole Saw Cutter Tool, 8mm, 4-Piece Product Name : Glass Hole Saw;Main Material : Metal Cutting Hole Diameter : 8 mm / 5/16inch;Shank Hole Diameter : 4 mm / 0.16inch Shank Size (Approx.) : 18 x 7 mm / 0.7inch x 0.27inch (LD);Total Length : 51 mm / 2inch Color : Silver Tone;Weight : 20g Package Content : 4 x Glass Hole Saw