Fast and easy loading, the Black Diamond Super 8 belay/rappel device uses a unique design that eliminates excess material by thinning out the non-rope bearing areas.. . . Modern 8 design for smooth handling. Ideal for the retro climber or Search and Rescue professional. Works well with double 8.1 mm ropes up to 11 mm single lines. Weight: 87 g. Strength: 15 kN. Imported.