Retail 2Pcs 30Mm / 20Mm Diamond Tipped Drill Bit Ceramic Tile Glass Hole Saw 2 x Glass Hole Saw: 1* 30mm + 1* 20mmProduct Name : Glass Hole Saw; Material : Metal, Diamond Particles/MetalColor : Silver ToneShank Size : 15 x 7mm/0.6 inch x 0.3 inch ; 8.2 x 24mm/0.3 inch x 0.9 inch(L*D); Total Length : 41mm/1.6 inch ; 55mm/2.2 inchCutting Hole Diameter(Approx.) : 30mm/1.18 inch; 20mm/ 0.78 inch. Shank Hole Diameter : 4.2mm/0.17 inchWeight : 37gSuitable for drilling hole on the glass, ceramic, marble, porcelain. High performance in cutting glass. Tiny diamond particles coated tip offers sharp cutting. Should be used with a electric drill, here is not included. Features diamond coating on this hole saw give superior performance and longer life. Excellent for making clean and accurate hole on glass, ceramic and tile. Works better with a electric drill(here is not included). Package Content :2 x Glass Hole SawOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.