【PACKAGE LIST】: 30mm, 40mm, 50mm drill bits, SDS+ arbors, pilot drill bits and 350mm SDS+ extension rod; This high quality TCT concrete hole saw set contains everything you need to get started. 【NECESSARY PARTS INCLUDED】: This core bit set comes with 1 locking screw and 1 pilot drill bit, it is quite practical to help stabilize the drilling process, ensure the tip of the tip will not move when you are drilling. 【PREMIUM MATERIAL】: This masonry drill bit set is made of Made of high quality tungsten carbide tipped material, high strength and excellent drilling performance for long-term tough drilling work, also durable enough to last for a long time. 【PRECISE CUTTING】: These are tungsten carbide tipped drill bits which are perfect for cutting clean holes in concrete, brick and cinder block. 【WIDE USE】: Suitable for brick walls, red bricks, masonry walls, foam bricks, hollow cores, etc. It can be used to install air conditioners, such as air conditioners, range hoods or washing machines.