uxcell Glass Tile Marble Diamond Coated Drill Bit Hole Saw Tool 8mm 5/16" Diameter Product Name: Glass Hole Saw Material: Metal Drilling Diameter: 8mm / 5/16"; Shank Diameter: 6mm / 1/4"; Total Length: 51mm / 2" Color: Silver Tone; Net Weight: 7g Package Content: 1 x Glass Hole Saw