ITEM NAME:Pieces Masonry Drill Bits Set for Concrete with Tungsten Carbide Tip Power New Product Description Description: 5 Pieces Masonry Drill Bits Set 4 5 6 8 10 mm Product description: Tungsten Car.Applicable type: multifunctional impact electric drill. Heat Treated Carbon Steel Shank. If item is defective after 3 months, you can still send it back to us. We will send you a new one after receiving the defective item.