Brass Clock Key Mainspring Winding Sz 10-13 4.75-5.5mm

This is a new set of 4 single end clock keys. They are used to wind clock mainsprings.

You receive:

• One size 10 clock key with a 4.75 mm hole
• One size 11 clock key with a 5.00 mm hole
• One size 12 clock key with a 5.25 mm hole
• One size 13 clock key with a 5.50 mm hole

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