uxcell 8mm 5/16 Inch Granite Diamond Coated Glass Hole Saw Drill Bit 5 Pcs Product Name : Glass Hole Saw;Material : Metal Drilling Diameter : 8mm / 5/16";Shank Diameter : 5mm / 1/5" Total Length : 51mm / 2";Color : Silver Tone Net Weight : 26g Package Content : 5 x Glass Hole Saw