1815140 Lenox 7 Piece Speed Slot Mini Hole Saw Kit IMPROVED METAL CUTTING PERFORMANCE : Increased wall thickness improves durability and minimizes tooth loss Optimized tooth design penetrates metal with easeFAST, EFFICIENT CUTTING IN WOOD : Larger, sharper teeth remove more wood for fast cuttingEASY PLUG REMOVAL : Speed Slot staircase design for fast, easy plug ejection7 PIECE HOLE SAW KIT : 7/8 in, 1 in, 1-1/8 in, 1-1/2 in, 2-1/8 in