This set includes 30mm, 40mm and 50mm basic drill bits, SDS+ chuck, pilot drill and a 350mm SDS+ extension shaft. Made of hardened metal, carbide tip. High quality tungsten, long service life. Suitable for brick walls, red bricks, masonry, foam bricks, hollow core drill bits, etc. It can be used to install air conditioning systems such as air conditioners, cooker hoods or washing machines. The teeth of the drill are sharp, the vibration during the opening process is small, and the operation is stable. Rounds off alloy blade combinations, with each blade taking on part of the workload and preventing cracking. Professionally designed discharge ports ensure smooth chip removal when opening. Comes complete with core drill, pilot drill and SDS mandrel, easy and fast to drill. Low pressure is important to prolong the life of the cutting tips and achieve a straight cut. They can not be used for concrete, load-bearing walls or walls with steel bars. Advantages: 1. Made of high quality metal