uxcell Tile Drill Bit 12mm Cutting Dia Hole Saw Cutter 5cm Long 20pcs Cutting Diameter: 12mm/ 0.47"; Product Name: Glass Hole Saw Material: Metal, Diamond Particles; Package Content: 20 x Glass Hole Saws Weight: 208g; Shank Size: 6.5 x 18mm/0.26" x 0.7"(D*L) Total Length: 50mm/ 2" Main Color: Silver Tone