CMI RNA Pulley

The RNA (short for roller-n-anchor) Pulley from CMI is machined from a solid block of aircraft grade aluminum and was designed in partnership with 3 Strand Design, owned and led by a field arborist. Its beefy tensile strength and flat surface make it ideal for use as a cinched canopy anchor. The pulley makes retrieving redirected canopy-anchored lines easier and less gear-intensive than with other options. When incorporated with a friction saver, the RNA reduces friction, making for a smoother climb.

The high tensile strength makes rescuable systems possible, as well. The axle’s MBS is 8,000 lbs, but any rope configuration that incorporates the plate benefits from an end to end rating of more than 10,000 lbs. The openings allow for a bight or two lines to pass through, which means an access line, whether separate or isolated by knots, can be incorporated into anchor systems using the RNA. Only properly trained professionals should build systems intended for possible rescue, to ensure all parts of the system are properly rated and installed.