TOOGOO(R) 20mm Diamond Tipped Drill Bit Ceramic Tile Glass Hole Saw Product Name : Glass Hole Saw;Material : Metal, Diamond Particles Color : Silver Tone;Cutting Diameter : 20mm/ 0.78" Shank Size : 15 x 7mm/0.6" x 0.3"(L*D);Total Length : 41mm/1.6" Weight : 13g