Originally designed as a way to tie big salmon flies with a small treble. Now widely used with single hooks. Slightly tempered for extra strength. Black finish with a leading up eye.Available in 6 sizes.#1 55mm (2 3/8") (suggested hook size 2-4)#2 45mm (1 3/4") (suggested hook size 4-6)#3 35mm (1 3/8") (suggested hook size 6-8)#4 25mm (1") (suggested hook size 8 - 10)#5 20mm (3/4") (suggested hook size 10 - 12)#6 15mm (5/8") (suggested hook size 12 - 14)25pc in a packet