Diamond Shaped Knurling is a decoration made on the surface of metals, mostly screws, bolts and other fasteners. This pattern consists of minor, crossing diagonal lines creating diamond-like impressions. This texture does not only provide a good grip, but also provides a professional and aesthetic appearance on the final product.The Knurled Diamond Pattern: This is a process which is ... https://www.pshardware.com/blog/advantages-of-buying-diamond-shaped-knurling-a-complete-guide-by-pshardware