uxcell 6.5mm Diameter Shaft 20mm Bore Diamond Tipped Glass Hole Saw Drill Bit Product Name : Glass Hole Saw;Main Material : Metal,Diamond Particles Cutting Hole Diameter : 20mm / 0.8";Shank Size (Approx.) : 14 x 6.5mm / 0.55" x 0.3" (L*D) Total Length : 40mm / 1.6";Color : Silver Tone Weight : 14g Package Content : 1 x Glass Hole Saw