LA SIESTA HAMMOCK HOOK
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The La Siesta hammock hook is good for hammocks or hanging chairs. The carrying capacity is 160kg.
It can be fitted in to wood or concrete. Obviously you need to double check the strength of the support before relying on it to hold your weight.
La Siesta hanging chairs all have a built in swivel, so you don't need to worry about the hammock hook coming unscrewed.