Ensuring you are Ready for the Road Ahead, the Power Products 4-Gauge 5/16 Standard Copper Lug is the heavy duty connector replacement between the battery post terminal and battery cable. Standard (button seam vinyl or insulated) terminals become worn with continued use of crimping, often splitting apart at the seam. Maintain a secure, proper connection with this standard copper lug. FleetPride is your First Click in Heavy Duty.