The George Barnsley Double Iron is a very popular tool, it is used in shoemaking when setting sole edges
 
The Double Iron is a handcrafted edge iron that has a double lip on the top and a single lip on the bottom which is smooth and domed inbetween
 
The Double Iron is finished with a traditional square shoemakers beech handle
 
Available in sizes A-G
Working distances
A - 1/8" 
B - 1/6"
C - 3/16"
D - 1/4"
E - 5/16"
F - 3/8"
G - 5/12"