: He measured the diameter of the circular hole. As wikiHow notes, this is typically 2 1/8 inches.

: He checked the door's width; it was a sturdy 1 3/8 inches, common for interior doors. Step 2: Choosing the Function

Arthur grabbed a tape measure, knowing that guessing was a fool’s errand.

: For closets or hallways where no lock is needed.

He weighed the aesthetics. Should he go for a classic look, a sleek Satin Nickel , or perhaps a rustic Oil-Rubbed Bronze ? He remembered the history of Osborn Dorsey , who patented the first internal latching mechanism in 1878, and decided to honor that heritage with a traditional round knob. Step 4: The Final Selection

Walking through the hardware aisle at Lowe's , Arthur saw his options were more than just "turn and pull":

: For bathrooms and bedrooms, featuring a locking mechanism.

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