Bosch Hole Saw HBT475 4 3 4 Inch Bi Metal M42 Cobalt Progressor Tooth Cutter (5 TPI Geometry Wood Stainless Metal Ventilation Structural Boring Tool) Reciprocating Saw Blade and stone fabrication professionals who and stone fabrication professionals who demand a flawless Ergonomic Straight Slip Resistant Grip: High traction textured handle sleeve ensures maximum leverage and grip control in wet or dusty jobsite conditions Linear Tooth Density Index 5 TPI (Teeth Per Inch) Geometric Tooth Profile Style Progressor Tooth Design Array Primary Cup Metallurgical Bond Bi Metal High Speed Steel with 8% Cobalt M42 Matrix Side Wall Ejection Geometry Triangle Shark Tooth Slot Configuration Connection Mandrel Requirement Standard Large Mandrel SpinLOCK Universal System Target Application Substrates Drywall and multi ply composites