GM CLIMBING Chest Ascender Abdominal Vertical Rope Access Arborist SRT Tree Climbing (Pack of 2) Material: Aircraft GradeAluminum Alloy UP Maximum Strength: 4kN / 890lb Dimension: 4.57x2.95inch / 116x75mm (HxW) Rope Compatibility Dia.: 0.315~0.472inch (8~12mm) Weight: 5.65oz x 160g SRT Arborist Working at height Rescue System, etc.