Large crank key for weight regulators and house clocks, very good workmanship and solid quality. Available in all common square thicknesses.
Outer diameter:
No 7, 8 : 8 mm
No 9, 10, 11 ,12, 13 : 10 mm
No 14, 15, 16, 17 : 11 mm
No 18, 19 : 12 mm
The dimensions stated are the application sizes which refer to the dimensions of the square shaft.
For a 4.5 mm square shaft, a No. 9 / 4.5 mm key is used.
The photo shown is a sample illustration, the actual version may vary in knob shape and material (brass or steel) depending on key size and availability.