The Steel Supply Company manufactures steel wedges both as standard stock sizes and made to order per customer's specifications. A wide range of tools and manufacturing processes are employed and, as with any process like this, costs are kept to the minimum that will allow a high-quality finished part. Nonetheless customers are frequently surprised at the difficulty of wedge manufacturing.
Steel Manufacturing Blog: Keeping it Steel
When shims are required to be angled, wedge shaped, or anything other than flat squares and rectangles, specific steps have to be taken to offset the difficulty these angles create.