HHIP 19 Piece 1-10mm X .5mm 135 Degree Point Cobalt Drill Set ~ Ground from solid blanks. ~ Provided in a steel index case. ~ Set includes 1 each of 1.0,1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, & 10mm. ~ Cobalt is used for drilling tough high tensile strength materials like stainless steel, titanium and inconel. ~ 135° split point provides self-centering properties and secure positioning on work surface and increases abrasion resistance.