WirthCo 30500 Battery Doctor Double Cable Side Mount Terminal Battery Bolt Double Cable Side Terminal Bolt for GM Trucks Ideal for RVs with dual batteries running in parallel Overall Length: 1.832," Nominal Diameter: 5/8" hex, Coupler Thread: 3/8-16 Battery Insert: .250" long, Stud Thread: 3/8-16, Stud Length: .960"