Heavy duty, precision ground, high speed steel. Jobbers have a flute length 9 to 14 times drill diameter. Oxide finish has two times life of a polished drill bit and resists corrosion. Porous layer holds oil for abrasion resistance and improved chip flow.
Warning:This product may expose you to chemicals including Cobalt, a chemical known to the State of California to cause Cancer. For more information go to www.P65Warnings.ca.gov