Strong Guarantee of Quality and Safety: All accessories are made of 304 stainless steel, with high hardness, corrosion resistance and weather resistance that does not cause obvious stretching or aging of the surface. Hammock hanger kit with flat top and lock nut can maximize strength. It is suitable for all kinds of swings, hammocks and punching bags with a working load not exceeding 350 kg. Special design: Integrated screw and gasket design, wear-resistant gaskets on both sides are shielded to reduce direct friction, provide high wear resistance and remain quiet. The bracket with lock nut can be rotated 180 vertically to better support the weight. The hanger hook bracket can freely rotate 360 and has a spring loop to help you firmly lock the hook without falling off by itself. Easy to install: Two 0.39 inch holes are pre-drilled on the hammock stand for bolting to concrete or wood beams. Including 2 expansion bolts for concrete construction and 2 hex screws for wood construction, as a complete set of accessories, it can be assembled in minutes. Detachable rotary ring: our hook can be flexibly assembled. By removing the rotating ring and placing it side by side with the spring-loaded carabiner, you can easily install heavy objects suspended by a strong chain or rope. Wide range of applications: our hook is very suitable for indoor and outdoor relaxation, you can install it, then hang the swing, hammock, aerial yoga sling for fun. It is also suitable for chandeliers, solar sails, punching bags, baby or toddler swings and any other heavy object within the load range. Heavy duty hooks suitable for concrete planks Features: Material : 304 stainless steel Weight: Hook: 0.24 kg Carabiner: 0.061 kg Expansion bolt: hexagon 0.042KG Screw: 0.026 kg Package includes: 1 x hook 1 x carabiner 2 x expansion bolts 2 x hexagonal Screws Installation Steps: 1. Draw the position of the punch 2. Drill two holes with a diameter of 8 mm or 12 mm and a depth of 70 mm 3. Use a hammer to screw 2 hex screws or 2 expansion bolts into the two screws to drill holes 4. Install the ceiling hook and tighten the screws with a wrench Features: The ceiling hook is made of high quality 304 stainless steel, which can provide a more stable, smoother and safer hanging. The load capacity is 350 kg. The bracket can be rotated vertically 180 , and the hook bracket can be freely rotated 360 . You can easily install heavy objects suspended by chains or ropes which are not easy to break. Very suitable for hanging swings, hammock chairs, punching bags, aerial yoga belts etc. Note: Not suitable for plasterboard ceilings, earth walls or other flexible building materials. Make sure that the surface you are climbing on can support the weight and forces involved.