Hole Enlarging Drill BitsMaterial: Carbide& Alloy SteelDiameter 22 - 65mm( 22mm 30mm 35mm 45mm 50mm 65mm)Total Length: about 68mmShank Diameter: about 9mmQuantity: 6pcsFeatures:Made of alloy steel, the blade is extremely sharped and resistance to cutting.When cutting chilled materials, cutting edge should be filling cooling liquid.Can be clamped on hand drill and bench drill, can be used for thick steel plates, cast iron, stainless steel, non-standard angle iron and other metal open hole.Package Included:6 x Carbide Drill Bit Hole Note:Please allow 1-2mm errors due to manual measurement.