Drilling tool assembly including a step drill bit

A drilling tool assembly comprising:

• an arbor assembly including a shank having a first end, a second end opposite the first end that is configured to be coupled to a power tool, and a longitudinal axis extending through the first and second ends;
• a step drill bit removably coupled to the arbor assembly, the step drill bit including a body having a proximate end adjacent the arbor assembly, a distal end opposite the proximate end, a plurality of axially spaced progressively sized steps between the proximate end and the distal end, and a bore centrally located through the step drill bit;
• and
• a pilot bit removably coupled to the arbor assembly and extending through the central bore of the step drill bit, the pilot bit including a first end that is coupled to the arbor assembly and a second end extending past the distal end of the step drill bit to define a cutting tip,
• wherein the arbor assembly further includes a sleeve disposed around the shank and moveable along the shank in a direction parallel to the longitudinal axis, the sleeve biased towards the second end of the shank to secure the step drill bit to the arbor assembly.

A drilling tool assembly comprising:

• an arbor assembly including a shank having a first end, a second end opposite the first end that is configured to be coupled to a power tool, and a longitudinal axis extending through the first and second ends, the arbor assembly made of a first material;
• a step drill bit coupled to the arbor assembly, the step drill bit including a body having a proximate end adjacent the arbor assembly, a distal end opposite the proximate end, and a plurality of axially spaced progressively sized steps between the proximate end and the distal end, the step drill bit made of a second material that is different than the first material;
• and
• a pilot bit coupled to the arbor assembly and extending through the step drill bit, the pilot bit made of a third material that is different than both the first material and the second material.