Lenox Tools 3006464L Bi-Metal Speed Slot Hole Saw, 4-Inch Size: 4 inches Style: Box, Model: 3006464L, Outdoor & Hardware Store Hole saw uses enhanced tooth geometry, a thin kerf design and advanced coating for efficient cutting Metal hole saw features SPEED SLOT technology with a staircase design for easy plug removal 4-inch diameter Compatible with 2L and 6L SNAP-BACK arbors and 2L, 3L, 6L and 7L standard arbors 90-day limited warranty