Omall OdiySurveil(TM) 8mm Diamond Drill Bit Tile Glass Hole Saw,Pack of 12 Product Name : OdiySurveil(TM) Hole Saw;Material : Alloy; Cutting Hole Diameter : 8 mm / 5/16";Shank Hole Diameter : 5 mm / 0.2"; Shank Size (Approx.) : 18 x 7 mm / 0.7" x 0.27" (L*D);Total Length : 51 mm / 2"; Color : Silver Tone;Weight : 59g; Package Content : 12 x 8mm Glass Hole Saw.