MagiDeal Rock Climbing Tree Arborist 1/2" - 5/8" Rope Grab Ascender Rigger Mountaineering Fall Protection Gear Roofing, tree arborist and rigger rope grab Suitable for 14-16mm (approx. 1/2-5/8inch) diameter nylon rope It can be used to rock climbing, high work, floor escape, rappelling, mountaineering etc. Strength: 25KN Material: High strength alloy steel