Milwaukee 49-56-0051 1-1/8-Inch Super-Tough Bi-Metal Hole Saw Positive Rake Angle for fast cutting Radiused Tooth Back reduces stress on teeth Deeper Gullets for fast chip removal and Functional Slot Geometry provides easy plug removal Aggressive cutting 4/6 tooth design 1 7/16 inch cutting depth Hole diameter 1 1/8 inch Heat resistant cobalt