Heavy duty ABS housing resists impacts. Spring-loaded cover keeps the terminals out of the Elements when not in use. Set screw holds wires firmly in place. Surdy terminals coated to resist rust. Terminals clearly marked to avoid confusion. Designed with solid brass contact blades. ⚠ WARNING: This product can expose you to Lead, DBP,CD, BPA ,hexavalent chromium, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.