When sourcing for B2B applications, prioritize the mandrel material, typically chrome-moly (Cr-Mo) steel, to ensure high tensile strength and durability. You must verify the stroke length adjustment capability, which prevents stripping threads on smaller nuts. For pneumatic models, check the traction power (pulling force)—a minimum of 19,000 N is recommended for M10-M12 stainless steel nuts. For manual tools, a long-handle double-hinge design is essential to maximize leverage and reduce operator fatigue.