LENOX Tools Bi-Metal Speed Slot Arbored Hole Saw with T3 Technology, 2-1/2" N/A Made in USA or Imported 2X more durable with 50% longer life than previous LENOX hole saws Increased wall thickness improves durability and minimizes tooth loss Optimized tooth design penetrates metal with ease Larger, sharper teeth for faster cutting SPEED SLOT staircase design for easy plug ejection