This 19-piece HSS cobalt drill set is designed for high performance and durability, particularly for drilling high tensile strength steels and stainless steel. The cobalt-alloyed drills provide exceptional heat resistance and cutting efficiency. Cobalt-Alloyed : High heat resistance, ideal for drilling steels with a tensile strength over 800 N/mm². Specialised Use : Particularly suitable for high alloyed steels, bearing steels, and hot and cold rolled steels. Excellent for stainless steel. Sizes : Includes drills in sizes from 1.0mm to 10.0mm in 0.5mm increments. Storage : Supplied in a sturdy plastic storage case. Brand : PTI