Antigravity Micro-Start Heavy Duty Smart Clamps Designed for rigorous use and enhanced durability, the Heavy Duty Smart-Clamps for the Micro-Start Xp-10 feature an all-copper construction, providing a robust clamping strength and a widened clamp area for superior contact with battery terminals of autos, trucks, and boats. Ideal for those who frequently perform jump starts, especially on larger vehicles, these clamps ensure a more efficient power transfer for starting up even the most stubborn engines. These HD Clamps are presented as an upgrade from the original clamps in the Xp-10 (Gen 1) kit, and as replacements or additional sets for the Xp-10-Hd, which exclusively uses these heavy-duty clamps. Features: Large 5 clamp (2 bigger than Original Xp-10 Smart-Clamps) All copper construction Better power transfer due to larger clamping surface area and stronger clamping force Aggressive larger jaw design with heavy clamping strength and bite Made for commercial and daily use 5 built-in safety protections including reverse polarity, short circuit and more Fits Xp-10 (Gen 1) Micro-Start power supplies (original or HD models)