Certified Adjustable 5mm Pure Copper Gold Plated Bullet Connectors Ultra Low Resistance Adjustable fit Reduces Connection Resistance by 50% Lowers Battery Temperatures up to 15% Pure Copper, Gold Plated Adjustability prevents plugs from loosening and falling out during a race Requires a .050" hex wrench to adjust length: Total 21.50mm, Shaft 16.00mm Fits all Batteries Requiring a 5mm Bullet Connector (2) long sets screws Includes (2) Males Bullets * TIP: Solder on the side with the grooves for lowest resistance.