6-piece HSS centre drill kit milling cutter for metalworking with 60 degree countersunk head lathe bitDescription.Traditionally used to make tapered holes for lathe centres in order to create a starting point for twist drill standards, designed to prevent the twist drill from moving.Used for workpieces that require machining between part centres or production centres.Fast cutting speed and good chip evacuation. for precise centre drilling of metals. Suitable for machining iron, steel, copper, aluminium, etc.Each bit is double ended and ground to a standard angleBy rotating between the tips, the front side of the workpiece receives the corresponding centring holeMaterial: HSS coated: Titanium coatedGrade: 60Included dimensions: 1.0mm 1.5mm 2.0mm 2.5mm 3.5mm5.0mmTotal length: 33mm, 36mm, 40mm, 43mm, 49mm, 60mmPackage includes: 6 x HSS centre drill countersunk bits