The mini rope grab easily slides in one direction, then locks in place as tension is applied in the opposite direction. Made of durable hard anodized aluminum. For use on 11mm to 16mm diameter ropes. To install simply remove the split key ring and unscrew the nut with a wrench and insert your rope or flip line. Replace the cam and bolt over the rope, tighten the nut with a wrench and reinstall the split key ring.