Miller Dowel's TruFit® Drill Bits, which are stepped to match a correspondingly-sized Miller Dowel, are made from industrial-quality high speed steel for longer cutting life. They are designed with an aggressive helix and polished flutes for efficient chip removal. Three positive locking flats are ground on the shank to prevent spin-out, and a split point prevents “walking” along the grain. TruFit® Drill Bits form precise pilot holes that provide a perfect fit for the parts to be joined.