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Cobalt Drill Bit - 21/64" x 4 5/8"
Drill through lightweight metal, steel and iron safely and easily with the Bosch Cobalt Drill Bit. It's built to withstand extreme temperatures and features a rigid design for superior stability while drilling through tough materials. This cobalt drill bit is also surface hardened, so it can penetrate tough abrasive materials like high-carbon steel, aluminium and titanium.