【Package Included】: Ø30mm, 40mm, 50mm drill bits, SDS+ chuck, pilot drill and 350mm SDS+ extension rod; This high-quality TCT concrete hole saw set includes everything you need to get started. 【Essential Parts Included】: This core drill kit comes with 1 locking screw and 1 pilot drill bit, which is very practical and helps to stabilize the drilling process and ensure that the tip of the drill bit does not move when drilling. 【High-quality Material】: This masonry cutter set is made of high-quality tungsten carbide tip material, which has high strength and excellent drilling performance, suitable for tough and long-term drilling operations, and is durable enough to last for a long time. 【Precision Cutting】: These tungsten carbide drill bits are ideal for cutting clean holes in concrete, brick and cinder blocks. [Wide Range of Uses]: Suitable for brick walls, red bricks, masonry walls, foam bricks, hollow bricks, etc. Can be used to install air conditioners, range hoods or washing