【PACKING LIST】: Ø30mm, 40mm, 50mm drill bits, SDS+ arbors, pilot drills and 350mm SDS+ extension rod; This high quality TCT concrete hole saw set contains everything you need to get started. 【REQUIRED PARTS INCLUDED】: This core drill set comes with 1 locking screw and 1 pilot drill bit, it is quite handy to help stabilize the drilling process, make sure the tip of the bit will not move when you are drilling. 【PREMIUM MATERIAL】: This masonry cutter set is Made of high quality tungsten carbide tipped material, high strength and excellent drilling performance for long time tough drilling jobs, 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 blockwork. 【WIDE USE】: Suitable for brick walls , red bricks, masonry walls, foam bricks, hollow souls, etc. It can be used to install air conditioners, such as air conditioners, hoods or washing machines. Note: Do not use