This is a handle-bar mounted brake lever and double caliper assembly. Each caliper is a single piston caliper. Most commonly used with 250cc ATVs and larger (300cc, 400cc, 500cc, etc.). Works well for 4WD machines. Caliper lines are approximately 53cm, the lever line is approximately 91cm and the distance between caliper mounting holes are approximately 6.3cm from center hole to center hole.