The only high-torque drill with low speed for ultra high strengh steels. The Original Spitznagel Spot Weld Drill that applies the cutting pressure pneumatically. You do not have to push on the drill bit. Our patented valved cylinder applies gentle pressure toward the panel. When the drill bit starts to turn even more pressure is applied. This Smart pressure valve helps prevent breakage of bits and applies correct consistent pressure from the first to the last spot weld, ensuring the long life of your bits by preventing breakage. DF-15DX Kit includes: (1) 1000 RPM Spitznagel Spot Weld Drill (1) 8mm HSCO Bit (2) 8mm Titanium Coated HSCO Spot Weld Drill Bits (1) 10mm Titanium Coated HSCO Spot Weld Drill Bit (1) Bottle of Pneumatic Tool Oil (1) In-line Oiler (1) Deluxe Storage Case This tool can drill through UHSS or Boron Steel when used with the DF-1690 Tungsten Carbide Bits. We have lowered the RPM on all our Spot Weld Drills so that our new bits for Boron cut more efficiently.