The LENOX Tools Bi-Metal Speed Slot Arbored Hole Saw with T3 Technology has enhanced tooth geometry that cuts 50% faster through common construction materials than previous LENOX hole saws. Twice as durable as our previous generation when cutting through low carbon steel, this bi-metal hole saw with a standard arbor features thicker walls to minimize tooth loss and improve durability. The SPEED SLOT staircase design places a wide slot low on the hole saw and multiple leverage points to make it easy to work plugs out with a screwdriver. This design effectively removes sawdust and chips and helps prevent plugs from becoming stuck in the saw. 10% taller than previous models, it delivers cleaner cuts through 2-by lumber.