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Which bit drills smooth, burr-free round holes in thin metal ducts for temperature probes?

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A step drill bit (or Unibit) features a conical stepped shape with integrated cutting steps. Unlike spiral bits, it will not catch, tear, or warp thin sheet-metal ductwork, cutting clean holes for insert-probe thermometers or sensor stems.

Which bit drills smooth, burr-free round holes in thin metal ducts for temperature probes?

Bi-Metal Toothed Hole Saw Kit

Conical Step Drill Bit

Wooden Paddle Spade Flat Bit

Carbide Tipped Masonry Twist Bit

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