Clock Key for Winding Clocks - Even This universal clock key is used to wind most clocks Brass key 5 Prong - Even Sizes Sizes: 2.75mm 7/64 in (2) 3.25mm 1/8 in (4) 3.75mm 0.14 in (6) 4.25mm 11/64 in (8) 4.75mm 3/16 in (10) SpecificationsBrand: SE