100% brand new and high quality The split drill bit prevents damage by gradually guiding the tool to the material without walking. Used to cut clean round holes quickly and easily. When cutting coolant, the cutting edge must be filled with coolant. Excellent chip removal performance, sharp edge and wear resistance. It can be clamped on electric drills and bench drills, and can be used to open holes in metals such as thick steel plates, cast iron, stainless steel, and non-standard angle irons. Specifications: DIY supplies: woodworking Type: Core Drill Bit Material: Carbide Specification: 12PC: 15/16/18/20/21/22/25/26/28/30/35/50/MM Suitable for: aluminum, steel, wood, plastic, gypsum board, stainless steel, etc. note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 12xCore Bit