'68 Coronet R/T
Oldtimer
It is. Hundreds of spot welds. I went through 3 HSS 5/16" spot weld drills on the smaller welds. The 3/8" Blair carbide bit is still going strong and lasts a lot longer. The trick with all of them is to keep your drill rpms low. Carbide is brittle and the uneven surface of the spot weld can chip them, HSS just wears down.