Bosch cobalt jobber drill bit for heavy-duty drilling in hard metals. M35 cobalt steel construction with thick web helix tolerates the heat of high-RPM cutting in stainless steel, cast iron, and high-carbon steel where standard high-speed steel bits glaze over and dull. Split point tip starts on contact without walking, so no center punch is needed.

• Bit diameter: 1/4"
• Overall length: 4"
• M35 cobalt steel - withstands high-temperature cutting (rated to about 1,100 deg F)
• Split point tip - starts on contact, no walking or skating
• Thick web helix for stability and fast chip clearance
• Surface hardened to resist abrasion and extend bit life
• Straight shank fits 1/4" and larger 3-jaw drill chucks
• For stainless steel, cast iron, alloy steel, high-carbon steel, aluminum, and light-gauge sheet metal

Tip: Run cobalt bits SLOW with steady pressure and cutting oil on metal. High RPM and dry cutting burn the cutting edge and shorten bit life - the cobalt is built for heat resistance, not for being run hot.