Dent Fix DF-1690 8x45mm Boron Killer Drill BitDent Fix DF 1690 8x45mm Boron Killer Drill Bit The DF 1690 Boron Killer spot weld bit is best used with the original Spot Annihilator DF 15DX with its patented Predator Approach prevents slamming of the drill bit into the panel. The ONLY way to drill through Boron Steel is with this bit. This drill bit was created to specifically cut spot welds from Boron Steel. Ultra High Strength (UHSS) also known as Boron Steel is used by many vehicle manufacturers
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