D2: A common stainless steel for lower-cost pocket knives that’s easy to sharpen. 440A/C: Lower-cost stainless steels that aren’t as durable but resist rust and are easy to sharpen.

What’s compelling about this new knife is that it manages to deliver ... While the LST’s blade is made of 400 series stainless steel and the Mini’s is 440A, the Ultra’s 2.7-inch drop ...