Product: Tungsten Carbide Step Drill BitsMaterial: Tungsten CarbideType: Imperial,Website:http://www.chinabettool.com, Metric, Non-standardProduct Description:Tungsten carbide step drill bits are designed to be many sizes, it can process step, suitable for many types materials, it is very good versatility, good for high speed feed cutting.We have some grade products for your choice, the tungsten carbide materials are from famous company or some China good suppliers, and we have many machines, some is made in China, and some is from oversea famous company.It will be long service life, I think you should have a try, it maybe a surprise to you.