Designed for heavy duty applications to resist vibration and moisture. Tin plated annealed copper for improved corrosion resistance, max conductivity and crimp strength. 3 part construction contains: inner Lug, additional copper sleeve for added strength, capability and seamless outer nylon cover. Serrated Barrel for greater wire retention/pullout strength. 22-18 wire gauge, Red color. 0.110 inch stud/tab size.