| | |  | Double End Keys | Home » » » » Double End Brass Clock Winding Key Clockmaker Tool Sz 7 | | | | | | | Description: | | New Double End Clock Key Size 7. This is a new brass double end clock key size 7. This is used to wind clock mainsprings. The small hole measures 1.75 mm. The large hole measures 4 mm. | | | | Customer Reviews: | |
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