3/4" Bi-Metal Hole Saw Rugged bi-metal cobalt construction for heavy-duty cutting.Deep cup cuts through studs in one pass.Variable pitch teeth for faster, smoother cutting and less vibration.Longer lasting design for more cuts per saw.Multiple knock-out slots and holes for easy core removal.Cuts through steel, wood, plastic, stainless steel, and cast iron.Note: Set pilot drill point 1/8" beyond tooth points.Note: Read and follow safety instructions in power tool owner’s manual.