This set includes 30mm, 40mm, and 50mm core drill bits, SDS+ chucks, guide drills, and a 350mm SDS+ extension shank. Made of hardened metal, high-quality tungsten carbide tip, long service life. Suitable for brick walls, red bricks, masonry walls, foam bricks, hollow core drills, etc. It can be used to install air conditioners such as air conditioners, extractor hoods, or washing machines. The drill teeth are sharp, the vibration is low during the opening process, and the operation is stable. Round alloy blade combinations, with each blade having to bear part of the workload, are not likely to tear. Professionally designed drain holes ensure smooth chip removal during opening. Comes complete with core drill, pilot drill and SDS arbor, easy and quick to drill. Low pressure is essential to extend the life of the cutting tips and achieve a straight cut. They cannot be used for concrete, load-bearing walls, walls with steel bars. Advantages: 1. Made of high quality carbide tipped metal,