If you need a full hanging kit rather than a lone item, then you can get good value by buying this pre-matched kit.  It is designed to hang hammock chairs, specifically from wood since the screw eye is most suitable for use in wood.

The kit includes:

• 1x 33cm Zinc Plated Iron Chain
• 2x 7cm S-Hooks
• 1x 11.5cm Screw Eye