Gun Drill BitsDrill Bit Annular Hole Saw With Weldon Shank Hollow Drill Bit For Magnetic Drill Metal Drilling Tool1 PcsSpecification:Type: Core Drill bit Material: High Speed Steel Coating: Blue Coating Application: Use for hole cutting and process of annular groove on various magneric drills and press ,like Alfra , Hougen , Jancy , Euroboor , BDS , RukoPackage Including: 1pc HSS core drill bit