The upper hole is usually used for carabiner

so that two ropes can be used at the same time without causing mutual entanglement

[ASCENDER SIZE] Works greatly with diameter 10-13mm static rope

firm and durable

outdoor sports

NewDoar Climbing Abseiling Belay Device ATC Rappelling Descender 25KN V-grooved Equipment-Orange chest ascender The upper hole is usually[Material]: Aluminium and Magnesium alloy forging. Weight: belay device: 60g 0. 132lb. [Double Slots Construction]: NewDoar descending Belay device offers effective braking to half, twin and single ropes, 8~11mm ( 0. 315 0. 433 inch). Breaking Strength: 25KN, Used with half, single or twin ropes. [Assures Safety]: High modified ""tube"" style belay device and V shaped groove channel, friction mode offers 3 times greater hold and stopping power than