High quality: The masonry drills, made of carbon steel with milling-sandblasting and heat treatment, are rust-free and long-lasting. High hardness alloy head increases sharpness and wear resistance, greatly improves drilling performance. Efficient: The strong carbide tip can easily drill holes in various materials such as brick, cement, etc. The deep spiral groove design improves the ability to remove debris during high speed operation. Compatibility: The drill set can be used for all types of impact drills with a round shank drill holder. Storage case: The solid plastic box with sliding lock is perfect for storage and transport and keeps the drill safe and in order. Package Content: 15 pcs in total. Masonry drill bits (3 mm x 60 mm x 3 pcs, 4 mm x 75 mm x 3 pcs, 5 mm x 85 mm x 3 pcs, 6 mm x 100 mm x 2 pcs, 8 mm x 120 mm x 2 pcs, 10 mm x 120 mm x 2 pcs), Weight: 1.1243575362 pounds, Manufacturer: Hang Zhou Great Star Industrial Co.,LTD