PROFESSIONAL HOLE SAW DESIGN – features improved durability, clean performance and easier plug removal in multiple materials ENHANCED M42 ALLOY – contains 8% cobalt alloy to withstand high-temperature applications, and it is stronger for cleaner cuts TRIANGLE CHIP-CLEARANCE SLOT DESIGN – improves efficiency of plug removal and reduces heat due to triangle shark tooth shape PROGRESSOR TOOTH DESIGN – hole saws feature alternating teeth size for performance, cutting faster and lasting longer in wood, metal and plastic materials REINFORCED SHOULDERS – provide added strength and longer life to the hole saws Deeper cup – can drill through thicker materials, for more applications in such materials as wood, drywall, metal and plastic Versatile – works with standard arbors and is ideal to pair with a SpinLOCK Universal arbor (sold separately)