Hole Dozer, 2.5", Carbide Hole Saw, Carbide Teeth For 50X Life In Extreme Materials, Long Life In Stainless Steel, 4TPI Carbide Teeth Design Gives Best Durability & Longest Life In Extreme Applications, Thermoset Coating Reduces Friction & Drag, Increasing Overall Speed & Cordless Efficiencies, Plug-Jack T-Slot's Enhance User Productivity By Providing Best Access & Leverage To Remove Material Slugs.