Brass Longshaft Clock Key
Sizes from 1.75mm to 6.75mm (NO.000 - No.18)
These are an extra long shaft clock key 2" or 50mm shaft
To establish the exact size of key your clock requires you will need to measure the width of the square winding pinion and purchase a key that is just a little larger. It should be a tight fit to avoid both slipping and wear whilst winding.