Super tough bimetal bit that doesn't freak out over nails. Great for drilling into nailed wood and lasts 50 times longer than regular bits for nailed wood. BITS FOR WOOD AND NAILED WOOD - Cleaner hole with less tear-out SPIRAL TIP - Faster drilling with less effort CONICAL THREAD - Reduces friction. Tri-Flute design clears chips super effectively FULLY HARDENED - Boosts durability 1/4" QUICK CHANGE HEX SHANK - Quick and secure hold