Professional Design: This is a universal battery clamp for inside diameter + poles: 19mm, - Poles: 17mm battery stack head. Designed for top post batteries and side post batteries with standard post adapters. Colour: Red and black; Material: Brass. Inner diameter of + poles: 19mm, - Poles: 17mm Voltage: 12V or 24V. Quick connector for car batteries: Simple and practical. It is designed for users who need to change batteries frequently. Positive and Negative Round Post Clamp Car/Van Copper Clip Connectors. Quantity: 2 pieces (1 x positive, 1 x negative).