CMI Lock PulleyThe CMI Lock Pulley is the perfect tool for rappelling enthusiasts who want more control over their descent. This pulley lets you adjust your position on the rope while you're rappelling, so you can take a break or move to a different location without having to stop completely. With its cam feature, the Lock Pulley also allows you to climb up your rope by using the attached pulley on the back. And because of its open ended design, you can attach it