- Belayer requires significantly less hand braking force to arrest a fall
- Lowering a heavier climber is much easier to control
- OHM is attached at the first bolt in the safety chain
- Should a lead climber fall at the first bolt, the OHM significantly reduces the risk of a possible ground fall
- Rope handling when belaying a lead climber not affected (no additional friction when paying out rope)
- Recommended weight difference (lead climber > belayer): 1 - 4 kg
- Minimum weight belayer: 4 kg
- For single ropes from 8.9 - 11 mm