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, range hoods or washing machines. The teeth of the drill bit are sharp, the vibration is small during the opening process, and the operation is stable. Rounds alloy blade combinations, each blade should bear part of the workload, not easy to tear. Size: 3 different sizes wall hole saws (65mm, 50mm, 30mm) are prepared for different cutting diameters, an all-in-one choice for daily use. Professionally designed drain holes ensure smooth chip removal when 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 can not be used for concrete, load-bearing walls, walls with steel bars. Advantages: 1. Made of high quality