8" tall bolt on furniture legs. Most furniture legs are M8 x 1.25 coarse or M10. It's an M8 and has the existing legs on my couch with ease and without incident replaced. The listing says 5/16", but they are metric. Increased sofa seat height from 13" to 18 ¼", the industry standard. Solid wood, with self-adhesive pads (to protect the floor) for legs.
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