Mainspring for German and English Clocks, Hole End

(Packet of 10 pcs)
A) 0.80 (2.10 x 2.20mm)
D) 1.00 (3.30 x 3.40mm)
B) 0.90 (2.50 x 2.60mm)
E) 1.10 (3.70 x 3.80mm)
C) 0.90 (2.90 x 3.00mm)
F) 1.10 (4.10 x 4.20mm)

(6½” Length)
Brass tapped to take ⅛ pendulum rod

Key sizes: 5-6, 7-8 and 10-12.
Put chuck in the handle and slowly release the mainspring.