uxcell 21mm Diameter Hole Saw Drill Bit Cutter for Glass Tile Product Name : Hole Saw;Material : Metal Cutting Diameter : 21mm / 0.83";Shank Size : 8 x 23mm / 0.3" x 0.9" (D * L) Total Length : 53mm / 2.1";Color : Silver Tone Weight : 21g Package Content : 1 x Hole Saw