High production grade M42 Cobalt Jobbers Length drills are made with 8% cobalt and are ground from a solid blank. This type of drill is used in high tensile material such as stainless and titanium. Ground from M-42 cobalt Solid Blank 135 degree split point HSS Jobber (standard) Length General Purpose Sizes #1 to 60 Sturdy Huot USA drill index.