This binding post set (1 Black, 1 Red) is ideal for building your own charging station or as a 12-24volt power access point for DC power applications. They are designed to pass through wooden or metal facias up to 25mm thick (they are insulated and required a 10mm mounting hole). The output terminals have 4mm holes to suit 4mm male banana plugs, the terminal tips can be removed to allow aligator clamp access, the screw on terminal caps are insulated with a hard plastic shell. Rated to around 100amps. Spec: Total length: 62mm Depth: 25mm Mounting hole: 10mm