Review on 🔩 DEWALT Industrial Cobalt Pilot Bit DWA1240 by Carlos Massey

They are advertised as heavy duty and capable of drilling through steel. I bought these to drill out 2 bolts from an intake manifold gasket repair. These are not hardened steel bolts, but ordinary aluminum bolts. These parts got hot quickly, and yes, they were lubricated. 2 screws broke after a few minutes of drilling. Another burst at the base. Total garbage. I wouldn't recommend it for anything heavy.