uxcell 4mm Dia Spear Point Head Marble Tile Glass Drill Bit 10 Pcs Material Carbide, Metal Brand Uxcell Surface Recommendation Tile Dimensions 5.8' 6.4' 0.7' Tip Size: 4mm/0.16"; Total Length: 65mm/ 2.6" Net Weight: 80g; Package Content: 10 Pcs x Glass Drill Bit Product Name: Glass Drill Bit; Shank Diameter: 3mm/ 0.12" Material: Metal , Carbide; Type: Spear Tip Color: Silver Tone, Gray