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    On a mission to get more people to enjoy the outdoors© 2026
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    Brand: Sterling

    Category: Climbing Ascenders, Pulleys & Rescue Systems

    Recommended by Brent Smith, AMGA Rock Guide and Apprentice Alpine Guide — Denver, CO

    The 6 mm Auto Block by Sterling is a reliable safety accessory designed for climbers and rappellers, providing essential backup support during long descents. Its durable construction and versatile design ensure peace of mind while navigating challenging terrains. 1. Constructed from high-strength 6 mm cord for exceptional durability and reliability. 2. Features a 13.5-inch loop that easily attaches to your harness for secure positioning. 3. Compatible with both prusik and Klemheist knot techniques for versatile use. 4. Lightweight design minimizes added bulk while maintaining strength. 5. Ideal for use with various rappel devices, enhancing safety during descents. 6. Bright color options for easy visibility in outdoor environments. The 6 mm Auto Block is primarily intended for climbers and outdoor enthusiasts who require a dependable backup system during rappelling activities. It excels in rocky terrains and vertical environments, making it suitable for both novice and experienced users. This product is particularly valuable in situations where extended rappels are necessary, providing an extra layer of safety during outdoor adventures year-round.

    Price: $18.99

    Expert Review

    My favorite friction hitch loop; its small and reliable

    Recommended by Brent Smith

    Frequently asked questions

    What does Brent Smith say about the 6 mm Auto Block?

    My favorite friction hitch loop; its small and reliable

    Why does Brent Smith recommend Sterling?

    Brent Smith recommends the Sterling 6 mm Auto Block for climbing ascenders, pulleys & rescue systems. My favorite friction hitch loop; its small and reliable

    Is the 6 mm Auto Block a good climbing ascenders, pulleys & rescue system?

    Yes — Brent Smith recommends the 6 mm Auto Block by Sterling as their climbing ascenders, pulleys & rescue systems pick. My favorite friction hitch loop; its small and reliable

    More from Brent Smith's Trad Climbing

    • Petzl Attache Carabiner
    • Black Diamond Infinity Cord
    • Blue Ice Missions Light Sling - 60cm and 180cm
    • Camp C.A.M.P. Photon Wire Straight Gate Carabiner
    • Petzl Reverso Belay Device
    Rendezvu
    6 mm Auto Block by Sterling — recommended by Brent Smith
    Climbing Systems

    6 mm Auto Block

    Brent Smith
    Brent SmithRecommended in “Trad Climbing”
    My favorite friction hitch loop; its small and reliable
    Purchasing through this link directly supports Brent
    Climbing Systems

    6 mm Auto Block

    Brent Smith
    Brent SmithRecommended in “Trad Climbing”
    My favorite friction hitch loop; its small and reliable
    Purchasing through this link directly supports Brent
    6 mm Auto Block by Sterling — recommended by Brent Smith

    This product is for…

    Climbers who use friction hitches and want a ready-made prusik loop rather than tying their own. The 6mm diameter suits those needing a reliable, compact option.

    Worth noting…

    Described as soft, supple, and small — qualities that matter for hitch performance and packability.
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