Milwaukee 49-56-0092 1-5/8-Inch Ice Hardened Hole Saw Ice hardened Features Bimetal teeth Made in the USA ICE HARDENED for up to 50% longer life than the competition Matrix II Bi-Metal Teeth for greater durability Positive Rake Angle for fast cutting Radiused Tooth Back reduces stress on teeth Deeper Gullets for fast chip removal and Funtional Slot Geometry provides easy plug removal