Lifting capacity in all directions and its double articulation allows it to line up perfectly with the slingFast and universal hooking with any kind of connection (without additional appliances)High tensile steel (Class >8)Safety factor 5Two ways of tightening: either by open-ended spanner or by Allen keyWLL indication engravedFrom M8 to M20 as standard; for loads from 0.3 To to 2.5 ToFrom UNC 516'' to UNC 34'' as standard; for loads from 650 LBS to 5, 500 LBSEach double swivel hook is tested and delivered with a certificate of conformity Central Safety Shackle: CSS