IES™ Boron Buster Carbide Spot Weld Bit. Finally a drill bit designed to cut spotwelds from Boron Steel! The Boron Buster Carbide Spotweld Bit has an AlTiN coating (Aluminum Titanium Nitride) that creates a protective oxide layer that keeps it hardness at higher temperatures and also improves lubricity. Tools coated in AlTiN typically last 3 – 10 times longer than uncoated tools. Comes with a “Tri-flute” head and a round shank that can be used in most conventional electric and pneumatic drills. Designed to cut spot welds from Boron Steel High Temperature Applications Recommended 900 RPM – 1,000 RPM Best When Used With #12020 Boron Buster Cutting Tool Lubricant/Coolant. Carbide bits are brittle and may break due to the angle, pressure and speed being exerted by the operator. We cannot warranty broken bits.