Hammocks Chair Spring Swivel Hook Hanging Kit – Heavy Duty Stainless Steel 500 LB Capacity Ultimate Hammock Bed Hardware

Package includes Hammock heavy duty spring, Chain, S hooks and Ceiling mount ( with 4 stainless steel mounting screws)

Mount plate and 4 screws can securely bolts into joist, beams, ceiling or other overhead surface.

A heavy duty 500 lb Springs help to provides bounce and level of comfort and relieve stress from impacts; The 16″ length chain is used to change the height of adjust-ability

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This screw for wood, if you want to screw into concrete or dry wall, you need to buy different screws for concrete or find a stud to drill into.