Features: Thistop quality TCT (tungsten carbide tipped)core drill set contains everything you need to get started. Includes 35mm, 40mm, 50mm, 65mm, 80mm and 110mm core drill bits, arbors, guide drills and a 300mm + extension shank. Theseare Tungsten Carbide Tipped Core Drills that are great for cutting clean holes in concrete, brick and block work. 35mm-45mmdrills are used to drilling water pipe and heater pipe, 55mm-80mm drills are used to air conditioner pipe, and 110mm used for 4inch wall fan. Comes with 2 locking screws and 2 guide drills.Specifications: Condition: 100% Brand New and High Quality Material: Alloy Color: Silver Core Drills Diameter: 35mm, 40mm, 50mm, 65mm, 80mm, 110mm Weight: Approx. 4300g Package Included: 6 x Core Drill Bits1 x 110mm Shank1 x 350mm Shank2 x Guide Drills 2 x Locking ScrewsNote:This product is a circle handle model, the circle handle model is suitable for light electric hammers; the square shank model is suitable for heavy electric hammers. Please confirm whether your equipment meets the requirements before purchasing..