Glass Hole Saw - TOOGOO(R) Straight Shank 8mm Diamond Drill Bit Tile Glass Hole Saw 12 Pcs Product Name : Glass Hole Saw 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"