You use Threading-bits (set of 6 pcs.) M 3 – M 12 when you want a coordinated combination of thread related tools in one set for workshop, assembly or service work. A matched set reduces selection errors between drilling, tapping, external threading and handling accessories.
M denotes the ISO metric thread system used widely in mechanical engineering, maintenance and general fastener work where metric screw threads are standard. The ground tool geometry supports a controlled cutting action and a consistent sizing trend in shop use. The HSSE material group is typically selected when you want higher hot hardness and wear resistance than standard HSS.