Exquisite and durable: The triangular bit is made of quality alloy material, with high hardness and sharp drilling, not easy to damage or break Wear-resistant triangular bit provides smooth chip removal, durability and long life long life Non-slip triangular grip design ensures firm operation and no slipping while drilling. Multi-size specifications: drill set includes 4pcs 6mm (1/4 inch), 2 pieces 8 mm (5/16 inch), 2 pieces 10 mm (3/8 inch), 2 pieces 12 mm (1/2 inch), a total of 10 pieces of punch , to meet your needs applicable equipment : electric drill, bench drill. Wide range of applications: the strong tip of the hand drill is powerful and easy to drill, suitable for steel, copper, stainless steel, iron, aluminum, ceramic tile, wood, plastic, glass, concrete, brick wall, cement, etc. . These triangular can meet the needs of manual work, maintenance, DIY, etc. Quality : quality triangular handle multifunctional can easily penetrate various materials, easy to locate, stable drilling , fast speed, no boundary damage and neat openings The practical drill kit is a nice gift for your friends who love crafts.