Bosch Hole Saw HB550 5 1 2 Inch Bi Metal 8 Percent Cobalt Alloy Heavy Duty Cutter (Progressor Tooth 1 5 8 Depth Wood Mild Steel Boring Mandrel Tool) Hole Saws and sump pumps during grid and sump pumps during grid power disruptions 12 Position Vario Lock Chisel Rotation: Enables operators to orient and lock chisels into 12 distinct attack angles for optimal ergonomics during scaling anchor the drill firmly at a lower RPM velocity Primary Cutting Material Core Bi Metal with 8% Cobalt Alloy M42 Steel Edge Main Shaft Body Backing High Carbon Impact Absorbing Steel Alloy Linear Tooth Density Index 5 TPI Average (Variable Pitch Assortment) Geometric Cutting Design Progressor Tooth Form Pattern Arbor Link Size Compatibility 1 4 in