Universal brass clock key with 5 prongs for winding clocks. The universial clock key covers most all the clock key sizes. The Even Sizes include: 2.75mm - 7/64 in (2), 3.25mm - 1/8 in (4), 3.75mm - 0.14 in (6), 4.25mm - 11/64 in (8), and 4.75mm - 3/16 in (10). Measurements are approximate.

Universal Clock Key

Used to Wind Most Clocks

5 Prong

Brass Key