The Jack Descender is a compact descender for work at heights designed mainly for rope access and rescue operations.
Its advantages are durability, maximum simplicity and intuitive operation. With JACK, work is fun.
can be used for positioning, ascending and descending on the work line, as well as for lowering and belaying persons
automatically locks the rope, allowing the user to concentrate fully on the work 
speed of movement on the rope is conveniently controlled by the lever
during development, emphasis was placed on maximum simplicity, intuitive rope insertion and smooth operation
with an unloaded rope, the locking mechanism can be deactivated by pressing the cam and thus the rope can be pulled out of the device without using the lever - this allows the device to be used, for example, for belaying a lead climber or for quick movement on a flat roof
easy retrieval of the rope allows the device to be used for short rope ascents
it is not necessary to disconnect the device from the harness when inserting and removing the rope 
no additional friction is required up to a load of 200 kg
compatible with a wide range of rope diameters 9.3 - 12 mm (see specifications for individual standards)
parts in contact with the rope are made of stainless steel, which prolongs the lifetime of the device
using a screw, the device can be permanently locked to the rope to create a non-removable system
lever and lock can be disassembled and cleaned if necessary
patented design with magnetic holding of the cam facilitates rope insertion
two color versions

EN 12841-C: max. load 200 kg, with static rope 10 – 12 mm
EN 341-2A: max. load 150 kg(max. descent length 100 m), with 11 mm static rope Singing Rock STATIC 11, min. temperature: -30 °C
EN 15151-1 type 6, with rope 9.3 – 11 mm