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If you need to bore holes that deep you're better off with a Forstner or spade drill bit. There are companies that make deep hole saws.
The 'Bottom Out depth is 1-5/8" so they'll easily bore 1-1/2" deep at a time.
Hello Fred, we do not suggest adding multiple extensions to the Milwaukee Hole Dozer General Purpose Bi-Metal Hole Saw Set.
Hello! Our nine-piece Hole Dozer General Purpose Bi-Metal Hole Saw Set includes five hole saw sizes, 3/4 in., 7/8 in., 1 in., 1-1/8 in. and 1-1/2 in.
Yes but, you have to go slow.
the spacer is used between the adapter and large hole saw when using the small arbor
1) 3/4" Hole Dozer™ Bi-Metal Hole Saw, (1) 7/8" Hole Dozer™ Bi-Metal Hole Saw, (1) 1" Hole Dozer™ Bi-Metal Hole Saw, (1) 1 1/8" Hole Dozer™ Bi-Metal Hole Saw, (1) 1 1-2 in Hole Dozer Bi-Metal Hole Saw, (1) Twist-Release Small Thread Quick Change Arbor, 3/8" (49-56-7210), (2) 1/4" x 3-1/2" High Speed Steel Pilot Bit (49-56-8010), (1) Adapter, (1) Spacer, and (1) 1/8" Hex Key.
The hole saw sizes are 3/4", 7/8", 1", 1-1/8" & 1-1/2".
Yes, these are designed to cut a variety of materials.