**2. Proprieties**

*RAD (Aubert & Duval)*: A ball bearing steel, and as such previously only used by forgers, it is available in bar stock now (**Figure 1**). It is similar to 5160 (though it has around 1% carbon vs. 5160 ~ 0.60%), but holds an edge better. It is less tough than 5160. It is used often for hunting knives and other knives where the user is
