Giaone Concrete Set Wall Drilling 30 40 50 65mm (1-3/16"-2-9/16") Masonry Kit for Concrete Cement Brick Stone

Size: 30mm ( 1-3/16" ), 40mm（1-9/16"),50mm(2"), 65mm(2-9/16"),1x 220mm 8-7/10", 1x center positioning drill bits (110mm 4-5/16"), 1x Screw,1x Key Wrench. This concrete set is selected of steel, high hardness, rust prevention, and durability, The comes with a ventilation holes, Easy to remove dust and effectively improve work efficiency. Suitable for multiple materials, such as hollow brick, cement wall, concrete wall. Can be used to install openings for air conditioning, range hoods, water pipes, water heaters, pipes, sewers. Equipped with a drill bit, suitable for all major manufacturers, Adding coolant during continuous high-speed drilling, It can prevent the drill bit from burning, Increase the service life of the product. This Concrete Kits comes with a portable storage case for convenient use and store.