uxcell 20 Pcs 6mm Dia Diamond Coated Drill Bit Marble Tile Glass Hole Saw Product Name : Glass Hole Saw;Main Material : Metal Cutting Hole Diameter : 6 mm / 15/64";Shank Hole Diameter : 4 mm / 0.16" Shank Size (Approx.) : 50 x 5.5 mm / 2" x 0.2" (L*D);Total Length : 50 mm / 2" Color : Silver Tone;Weight : 70g Package Content : 20 x Glass Hole Saw