The Master Pro was developed specifically for both belaying and rappelling purposes. This multifaceted tool is renowned for its versatility, dynamic performance, and unwavering reliability in reducing the force exerted on anchors, the belay system, and mitigating wear and tear on the rope over time. Moreover, it boasts the capability to operate in guide mode, functioning as a self-locking plate for effectively belaying a second climber. The two "horns" that are placed at one of the two ends have two main functions:

- Additional braking with thin ropes by passing them below the horns themselves.
- Possibility of hooking a webbing ring for a release manoeuvre.

Designed with a number of holes throughout the sides, not only does it reduce weight, but above all to disperse the heat and consequently not to overheat the rope that passes through.