Super tough bimetal bit that doesn't shy away from rough use. Great for drilling 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 POINT - Faster drilling with less effort TAPERED THREAD - Reduces friction. Tri-Flute design clears chips super effectively FULLY HARDENED - Boosts durability 1/4" QUICK CHANGE HEX SHANK - Quick and secure hold