Specifications:NameDiamond Coated Hole Saw Drill BitsMaterialSteel + Diamond SandProduction ProcessElectroplatingColorSilverSizes6/8/10/12/14/16/18/20/22/25/28/30/35/40/45/50mm Feature:▲ Super Quality: Diamond drill bits are made of industrial-grade carbon steel with a nickel-plated coated body to r..