Petzl HUIT, Figure 8 Descender

Description
Square shape helps reduce rope twist and girth hitch formation
Compact and lightweight
Small hole can be used with thin ropes if necessary, or as a belay plate
Specifications
Material(s): aluminum
Weight: 100 g
Rope compatibility: 8 to 13 mm (single and half ropes)
Working load limit: 100 kg

References