Perforator It is cut clean, smooth, no broken edges and no trembling phenomenon.Small incision resistance, improves the opening speed.Excellent for clean and precise holes on glass and tiles.Designed with diamond coated tip and rugged metal housing, provides good performance and longer life. It is cut clean, smooth, no broken edges and no trembling phenomenon. Small incision resistance, improves the opening speed. Excellent for clean and precise holes on glass and tiles. Designed with diamond coated tip and rugged metal housing, provides good performance and longer life. Product name: glass hole saw Material: metal Color: silver Cutting hole diameter: 4 mm / 0.16" Shaft hole diameter: 2 mm / 0.07" Shaft diameter (): 2 mm / 0.07" Total length: 50 mm / 2" Size: 5x0.2x0.2cm / 2x0.07x0.07Inch Weight: 25g Package Included: 10 x glass hole saw Note: Light 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.