Set with stainless steel extension spring do hanging hammock chair Description: Made of high strength stainless steel; anti-corrosion and rust, strong and durable. Capacity: 500KG for anchor Non-removable hook and large diamond-shaped base, stable. Great do hanging chairs, hammocks, porch swings, punching bags, swings, heavy bags and other items with mounting nad head. Specification: Material: stal stainless Kolor : Diamond plate (L. x width x D. ): approx. 80x48x2,3 mm/3,15x1,89x0,09 inch The Diamond (H) x width x D. ): approx. 27x20x8mm/1.06x0.79x0.31 inch Spring (L. x D. ): approx. 108x40mm/4.25x1.57 inch Hook length: approx. 100 mm 3.94 inch Double Length: 89mm/3.5 inch Carabiner (L. x depth. ): approx. 79x8mm/3,11x0,31 inch Screw size M5x50 The package includes: 1 piece diamond ceiling plate 1 piece spring 1 piece double 1 piece carabiner 4 pieces of screws : Due to the difference between different monitors, the image may not reflect the actual color of the item. Due to manual measurements, a size error of -2mm may occur.