Features The oval chip hole design promotes chip removal and the cutting resistance is low. Diamond material blade for high hardness and durability, sharpened for high drilling efficiency. For use with hand drills, bench drills and other equipment to enable faster drilling. Non-slip handle design, suitable for clamping, strong torque, general stability. Suitable for all types of stone, marble, concrete, ceramic, vitrified tiles, glass, etc. Specification: Condition: 100% brand new Item Type: Marble Hole Drill Material: Diamond Process: Brazing Color: Golden Hole diameter: approx. 14mm/0.55", 16mm/0.63", 18mm/0.71", 20mm/0.79", 22mm/0.87", 25mm/0.98 Customs Handle diameter: approx. 8 mm/0.31 inch Specification: 6pcs/set Applicable equipment: electric drill, bench drill Scope of application: Suitable for all types of stone, ceramics, vitrified tiles, glass, etc. Package list: 6 x Marble Hole Drill Bits Package List 6 x Marble Hole Bit