ITEM NAME:4Pc 6Mm- 12Mm Hex Shank Titanium Tungsten Drill Bit Carbide Tile Glass Cros E7Y8 4Pc 6Mm- 12Mm Hex Shank Titanium Tungsten Drill Bit Car.Use: masonry drilling. Working length: 49mm(6mm)/68mm(8mm)/66mm(10mm)/67mm(12mm). Overall length: 98mm(6mm)/107mm(8/10mm)/119mm(12mm). Type:Center Drill Bit. 4 Glass drill bit. Material: steel. Color: gold.