Specifications:
Material:HSS4241
Surface treatment: Natural color

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

Natural color 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.