An anchoring device for a deck or dock or similar structure comprising an anchoring member, a holding plate, and a fastener. First, the fastener is threaded through the holding plate and ring assembly. Then, the holding plate and fastener is inserted through an opening in the support structure, e.g., a narrow slot between the boards on the deck or patio, and, finally, the fastener is pulled outward in relation to the anchoring member to securely affix the anchoring member and the holding plate against two opposing sides of the support structure.