Review on 🔩 NEIKO 10052A Spot Weld Drill Bit, Titanium Coated High Speed Weld Cutter, 8mm (5/16-Inch), made from Cobalt Steel by Derrick Lowell

Not bad, but not too good either. Keep your drilling speed slow and they'll last a lot longer. Once you quickly roll them out and heat them, they're done. These were the cheapest bits in this style of spot welding and were used to drill spot welds into the side of the short receiver box. One side of the box per punch is all I could get from them. There are better quality bits for a little more money that last a lot longer.