uxcell 6mm Dia Spear Point Head Marble Tile Glass Drill Bit 10pcs Tip Size: 6mm/0.24"; Total Length: 73mm/ 2.9" Net Weight: 121g; Package Content: 10pcs x Glass Drill Bit Product Name: Glass Drill Bit; Shank Diameter: 4.5mm/ 0.18" Material: Metal , Carbide; Type: Spear Tip Color: Silver Tone, Gray