The Rocker is a self-tailing rope access back up device and can be used hands-free when traveling up or down the rope. Weight: 164 grams (5.78 ounces)|Strength: MBS: Dependant on rope type|For use with single ropes from 10.5 - 12.7mm (3/8" - 1/2")|For use without a shock absorber|Can also be used on a work positioning lanyard / flipline (in accordance with EN358)|Thumb-catch can be used to park the device|Certifications: CE EN353.2, EN358, EN12841-A