Most listings show a 4 mm thread diameter and use metric M4 mounting screws. One listing also notes a 1/2" (12.7 mm) measurement for the knob base diameter, which is a knob dimension rather than the screw thread size.
A 10‑knob pack commonly includes 20 screws (two per knob). Smaller packs, such as 4‑knob sets, often include 8 mounting screws (two per knob) in the package.
Listings commonly include two screw lengths to fit different thicknesses, and several note breakaway or cut‑to‑length screws that you can shorten by snapping or trimming to match the door thickness.
The listings reference metric M4 screw threading (4 mm thread diameter) as the mounting screw standard in multiple descriptions.
Most of the knobs use a single‑hole (single‑bore) mounting style and include compatible mounting screws for installation into a pre‑drilled hole.
Screw and knob measurements are shown in both millimeters and inches. Listings commonly display lengths and diameters in dual units (for example, 25 mm / ~0.98" and 4 mm / ~0.16").
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