PACKING LIST: 30mm, 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 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 drill. PREMIUM MATERIAL: This masonry cutter set is Made of high quality tungsten carbide tipped material, high strength and excellent drilling performance for long term 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 cores, etc. It can be used to install air conditioners, such as air conditioners, hoods or washing machines. Note: Do not use steel, tile and stone. This core drill bit set which includes all the basic accessories needed to drill masonry, it's an ideal tool set to start your job. With 3 kinds of premium TCT pilot drill bits and an extension shank with round shafts, it's really a practical and worthy dill drill bit that you can't miss. Features: Durable - This SDS Plus shank hole saw set made of carbide tipped metal material, very durable; Excellent workmanship - Simple operation, easy to use and fast punching, ideal for cutting clean holes in concrete, brick and cinder block Applications: It can be used to install air conditioners, such as air conditioners, extractor hoods or Washing machine . Punching pipes, etc. Features: Condition: 100% brand new and high quality Weight: 1.5kg Material: Carbide Metal Color: Silver Sprue Diameter: 30mm, 40mm, 50mm0 Package Included: 3 x core drills 1 x 350mm shank 1 x guide drills 1 x locking screw