Lenox 3002525L Bi-Metal Speed Slot Hole Saw 25L 40MM The Lenox 3002525L speed slot hole saw features a patented vari-tooth design which optimizes cutting for fast cuts and long tool life. Features: IMPROVED METAL CUTTING PERFORMANCE: Increased wall thickness improves durability and minimizes tooth loss, optimized tooth design penetrates metal with ease FAST, EFFICIENT CUTTING IN WOOD: Larger, sharper teeth remove more wood for fast cutting EASY PLUG REMOVAL SPEED SLOT: staircase design for fast, easy plug ejection Specification: Diameter: 1-9/16\" Arbor: 2L, 3L, 6L or 7L