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Features: Titanium three edge chamfering It is suitable for use in the workpiece which the hardness is under 25 degrees,such as aluminium sheet,thin iron plate,the insulating board or PVC board It's very sharp and durable,you use it for a long time Specifications: Material:Supersteel 4241 Surface treatment:Titanium-coated Size:Head diameter*the shank diameter*total length 6.3MM:6.3MM* 5MM* 37MM 8.3MM:8.3MM* 6MM* 40MM 10.4MM:10.4MM* 6MM* 39MM 12.4MM:12.4MM* 10MM* 46MM 16.5MM: 16.5MM* 10MM* 47MM 20.5MM:20.5MM* 10MM* 47MM Package Included: 6pcs Titanium three edge chamfering