Automatic rope-grab fall arrester for kernmantle 10.5mm diameter rope. Slide freely on the rope and block at the slightest sign of a fall. Can be attached to the rope or removed from it at any location. As soon as the connecting karabiner is put back into place, the arrester is locked and ready for use. With 28cm. extension strap & self locking karabiner (17mm. opening). Body in Plated Steel. CE EN353-2. Cable leash prevents web strap from falling off.