Lenox 3004040L Bi-Metal Speed Slot Hole Saw 40L 64MM The Lenox 3004040L speed slot hole saw features a patented vari-tooth design which optimizes cutting for fast cuts and long tool life. These hole saws are great for use in many applications including plumbing and electrician work and can cut both wood and metal. The speed slot staircase design allows for fast, easy plug ejection. Features: Improved metal cutting performance Increased wall thickness improves durability and minimizes tooth loss whilst the optimized tooth design penetrates metal with ease Ensure fast, efficient cutting in wood thanks to their larger, sharper teeth Easy plug removal Speed slot staircase design allows for fast, easy plug ejection Specification: Diameter: 2-1/2\" Arbor: 2L, 3L, 6L or 7L