Features:Shank: round handleFinish: White DiamondUsed in hardness 25 �� below the workpiece， such as carbon steel， sheet iron， insulation board， PVC board， woodSpecifications:Specification: Head Diameter *Shank Diameter * Length 6.3MM: 6.3MM*5MM*37MM8.3MM: 8.3MM*6MM*40MM10.4MM:10.4MM*6MM*39MM12.4MM:12.4MM*10MM*46MM16.5MM:16.5MM*10MM*47MM20.5MM:20.5MM*10MM*47MMMaterial:HSS4241Package Included:6pcs Three edge chamfering