Movable fall arrester intended for ropes Ø 10 – 12 mm, length adjuster and positioning device; captures a fall, slip, or uncontrolled abseiling; it also locks in the event of an unintentional grab during a fall; it can be used on a vertical or inclined rope; moves up and down the rope without the need for an operator; easy installation at any point of the securing rope; can be used with a fall arrester with an integrated loop.