Features and Benefits: UL certified to NFPA 1983 “T” Technical Use as required by most US government and private agencies. Side plates are precisely tensioned and for easy one-handed operation and secure placement at any point along the rope. Matched double-bend side plates help to eliminate compression under load and the resulting friction on rope or sheave. Low profile fasteners help to reduce snagging and hanging up when pulley is being moved. Wide base design works most efficiently with Prusik cords of up to 8mm. Over-sized top hole is designed for use with multiple carabiners. Single may be rigged with 2 carabiners in such a way that the 2nd carabiner may serve as a Becket. Made in the USA.