5/8" barrel; approximately 2-1/8" long. Current Rating: 4A@ 125V AC, 2A@ 250V AC. Initial Contact Resistance: 10 Meg ohm (Max.). Insulation Resistance: 500V DC 100 Meg ohm (Min.). Dielectric Strength: 1500V AC for 1 Minute. Contact Material: Brass - Silver Plate. Terminal Material: Brass - Silver Plate. Terminal Type: Screw. Key Pull: ON or OFF Position. Actuator: Barrel Key (All keyed Alike). Key removable On or Off.