Features: Expanded insulation support accepts standard and large wire diameters providing lower inventory requirements and greater flexibility; Funnel entry for easy wire insertion; Manufactured of pure electrolytic copper to provide maximum conductivity, low resistance and ductility for excellent crimp forming properties; Deep V groove serration in the inner barrel for added holding strength and better conductivity; Electro-tin plating for durable, long-lasting corrosion resistance; 600 Volts maximum, 105°C maximum