Steel shanks are used to provide arch support.
In shoe making the shank is located above the outer sole at the narrowest or middle part of the shoe between the heel and the ball of the foot just below the arch.
Sold as a pair.
See photos for measurements.
**Regarding Shipping: Website does not allow numerous shipping methods so all items are priced with a USPS Medium Flat Rate Priority Mail box. I do fit purchases in the smallest box/envelope possible & shop for the cheapest shipping method.
If you are only purchasing shanks I can fit them in a small shipping envelope. The estimated shipping cost is $5-8 this depends on where I ship to as I am shipping from Oakland, CA. I refund any shipping difference after I ship items.
Thank you for your understanding.