Groove 6X Speedbor is six times faster than standard flat drill bits. The bits are fully hardened, which improves their durability and increases their service life. Their compact length also makes them suitable for working in tight spaces. WOOD SIDE BLADES - More accurate hole with less tearing THREADED TIP - Faster drilling with less force TAPERED THREAD - Reduces friction. Tri-Flute construction removes chips effectively FULLY HARDENED - Increases durability 1/4" INCH QUICK CHANGE NECK - Fast and secure clamping